Research Article |
Corresponding author: Rick Overson ( rickoverson@gmail.com ) Academic editor: Marek Borowiec
© 2015 Rick Overson, Brian L. Fisher.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Overson R, Fisher BL (2015) Taxonomic revision of the genus Prionopelta (Hymenoptera, Formicidae) in the Malagasy region. ZooKeys 507: 115-150. https://doi.org/10.3897/zookeys.507.9303
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In this study we revise the taxonomy of the genus Prionopelta for the Malagasy region, treating seven species, six of which are newly described (P. laurae sp. n., P. seychelles sp. n., P. subtilis sp. n., P. talos sp. n., P. vampira sp. n., P. xerosilva sp. n.), and one redescribed (P. descarpentriesi Santschi). One species, P. seychelles, is restricted to Seychelles, while the six remaining species treated are endemic to Madagascar.
Afrotropical region, Madagascar, equatorial rainforest, taxonomy, Amblyoponinae, Prionopelta
The genus Prionopelta Mayr, 1866 contains 21 species, including six that are newly described here. In his species-level treatment of the genus,
The present contribution includes all specimens of Prionopelta collected from the arthropod survey project conducted in Madagascar by B.L. Fisher and the members of the Madagascar Biodiversity Center from 1992 through 2013 (
HW Head width: maximum head width in full-face (dorsal) view.
HL Head length: maximum head length in full-face (dorsal) view, measured from the anteriormost point of the clypeal margin to the posteriormost point of the head proper.
SL Scape length: length of the scape (first antennal segment) excluding the basal neck and condyle.
WL Weber’s length: diagonal length of mesosoma in lateral view from the posteroventral margin of propodeal lobe to the anteriormost point of pronotal slope, excluding the neck.
PetL Petiole length: midline length of the petiolar node (excluding the anterior peduncle) in dorsal view.
PetW Petiole width: width of the petiolar node in dorsal view.
T1W First gastral segment width: width of first gastral (third abdominal) tergite in dorsal view.
CI Cephalic index: HW / HL × 100
SI Scape index: SL / HW × 100
PI Petiolar index: PetW / PetL × 100
Collection abbreviations follow Bolton (1980) and Evenhuis (2009). The material upon which this study is based is located, or deposited at the following institutions:
BMNH The Natural History Museum (British Museum, Natural History), London, U.K.
CASC California Academy of Sciences, San Francisco, California, U.S.A.
MCZC Museum of Comparative Zoology, Cambridge, Mass. U.S.A.
MHNG Muséum d’Histoire Naturelle, Geneva, Switzerland
NHMB Naturhistorisches Museum, Basel, Switzerland
PBZT Parc Botanique et Zoologique de Tsimbazaza, Antananarivo, Madagascar
PSWC Philip S. Ward Collection at the University of California Davis, CA, U.S.A.
Sculpture of the head and dorsum of the mesosoma is of high diagnostic value in identifying Malagasy Prionopelta. In describing sculpture we use the same terminology as
When identifying Malagasy Prionopelta, it is helpful to recognize three qualitative conditions concerning the arrangement of foveae on the head. The first condition occurs when foveae are relatively equally spaced from one another at a distance that is greater than the diameter of an individual fovea, with smooth, shining integument present between foveae (Fig.
Head in full-face view. A P. xerosilva (CASENT0157254) B P. vampira (CASENT0461978) C P. descarpentriesi “morphotype-A” (CASENT0034837) D P. descarpentriesi “morphotype-C” (CASENT0191895).
Prionopelta can be recognized from other Malagasy genera through the following combination of characters: petiole which lacks a posterior face due to its broad attachment to the gaster; elongate, subtriangular mandibles with three teeth positioned distally on a distinct mandibular face; apical tooth the longest, and second tooth the shortest with a mid-length third tooth; antennal segments variable (either 9 or 12 for Malagasy species) but always with a four-segmented club; body overall never more than 3 mm in length.
Prionopelta descarpentriesi Santschi, 1924
Prionopelta laurae sp. n.
Prionopelta seychelles sp. n.
Prionopelta subtilis sp. n.
Prionopelta talos sp. n.
Prionopelta vampira sp. n.
Prionopelta xerosilva sp. n.
1 | Nine antennal segments present, palest and smallest of the Malagasy Prionopelta (HL < 0.4 mm and HW < 0.3 mm); entire body pale yellow (Fig. |
P. laurae |
– | Twelve antennal segments present; not as small as above (HL > 0.4 mm and HW > 0.3 mm); varying in size and color | 2 |
2 | Cephalic foveae widely and evenly spaced such that they are only extremely rarely adjacent to one another; all cephalic foveae appear as if scooped out of a flat, shining surface, and completely lack raised margins at their perimeter (Fig. |
3 |
– | Cephalic foveae of variable spacing but never as sparse as above; at a minimum, head with several clusters of two or more foveae which are directly adjacent in full-face view (Fig. |
4 |
3 | Metanotal suture absent in dorsal view, in its place a smooth surface with no clear boundary dividing mesonotum and propodeum; posterior margin of the propodeum convex and crescent-shaped in dorsal view (Fig. |
P. vampira |
– | Metanotal suture present; posterior margin of the propodeum relatively straight in dorsal view (Fig. |
P. xerosilva |
4 | Vast majority of cephalic foveae densely positioned so they are directly adjacent to one another; vein-like ridges present running between foveae producing the appearance of a netlike pattern across the entire head (Fig. |
5 |
– | Cephalic foveae variable in their spacing, but always with some foveae directly adjacent and others isolated from one another; usually with the frequency of adjacent foveae increasing laterally to medially (Fig. |
7 |
5 | Coronal suture present on head which appears as a uniformly thin, linear scar that swells above the surrounding integument under high magnification (Fig. |
P. subtilis |
– | Coronal suture absent on head; median cephalic band wider and more irregular, never uniformly swelling above the surface of the surrounding integument as a suture, appearing instead as a shining area devoid of foveae (Fig. |
6 |
6 | Cephalic foveae small and densely positioned so that the vast majority are directly adjacent to one another with swollen ridges between; median cephalic band devoid of foveae is wide, usually wider at its base and narrowing posteriorly (Fig. |
P. seychelles |
– | Cephalic foveae large, deep, and densely placed, joining to form a network of tall, jagged ridges; median cephalic band lacking foveae is usually thin and narrow, but its boundaries are irregular and jagged (Fig. |
P. descarpentriesi (in part) |
7 | Distinctly tricolored body with dark brown, uniformly colored head, lighter brown body, and pale yellow legs (Fig. |
P. talos |
– | Not distinctly tricolored as above; some individuals possess dark brown on head but always at least with lighter brown present at the posterolateral corners of the head which resembles the color of the mesosoma (Fig. |
P. descarpentriesi (in part) |
A, B Mesonotum and propodeum in dorsal view. A P. vampira (CASENT0461978) B P. xerosilva (CASENT0157254) C mandibles of P. vampira, demonstrating that apical tooth is greater than four times the length of third tooth (CASENT0461978) D mandibles of P. xerosilva, demonstrating that apical tooth is less than four times the length of third tooth (CASENT0157254).
Head in full-face view. A P. subtilis (CASENT0033641) B P. subtilis (CASENT0151601) specimen rotated to demonstrate raised coronal suture C P. seychelles (CASENT0161311) D P. descarpentriesi “morphotype-C” (CASENT0191895).
A, B, C Head in profile. A P. talos (CASENT0339229) B P. descarpentriesi “morphotype-A” (CASENT0168970) (photo: Michele Esposito 2014) C P. descarpentriesi “morphotype-C” (CASENT0042668) (photo: Michele Esposito 2014) D, E, F close-up of eye. D P. talos (CASENT0339229) E P. descarpentriesi (CASENT0168970) (Michele Esposito 2014) F P. descarpentriesi (CASENT0042668) (Michele Esposito 2014).
P. descarpentriesi lectotype worker (CASENT0101547). A Head in full-face view B Body in profile C Body in dorsal view.
Prionopelta descarpentriesi Santschi, 1924b:195.
Lectotype, pinned worker, CASENT0101548 [designated here], MADAGASCAR, Ikelivia, 30.ix.1923 (Descarpentries) (NHMB) [examined]. Paralectotypes, one pinned worker CASENT0101547 with same data as lectotype (NHMB) [examined].
P. descarpentriesi can be identified by the following combination of characters: twelve antennal segments; median cephalic band lacking a thin suture that is swollen above the surrounding integument; placement of cephalic foveae ranging from sparse to dense, but always at minimum, with at least several clusters of foveae directly adjacent to one another (if nowhere else, then medially in full-face view); if all foveae on the head are directly adjacent so that no flat, shining space is present between foveae, then foveae are large and accompanied by pronotal sculpture which is characterized as being both similar in size to that on the head and not consisting of smaller foveae or punctures; eye appearing as either an asymmetrical dark patch which appears to be a stain in the cuticle that is flush with its surrounding integument, or a single, slightly rounded glob with no definable subunits.
(N=25). HL 0.42–0.53 (0.48); HW 0.32–0.43 (0.38); SL 0.22–0.3 (0.26); WL 0.46–0.6 (0.52); PetL 0.11–0.2 (0.16); PetW 0.17–0.26 (0.22); T1W 0.29–0.37 (0.33); CI 74.64–85.1 (79.6); PI 118.23–173.29 (141.94); SI 61.46–72.38 (67.31).
Posterior margin of the head straight to weakly concave in full-face view; spacing of cephalic foveae highly variable, ranging from individuals with dense, directly adjacent foveae covering the entire head (known only from far eastern and northern Madagascar, see morphotype descriptions below), to individuals with foveae more widely spaced so that shining areas are visible between; median cephalic band devoid of foveae ranging from wide to extremely narrow but never appearing as a linear suture that is uniformly swollen above the level of the surrounding integument; apical tooth intermediate in length; evenly-space pronotal foveae range from shallow to deep; shallow foveae present on mesonotum and propodeum.
This widespread species has been collected from leaf litter from 10–1860 meters of elevation. While found most commonly in rainforest and montane rainforest, it has also been collected in Uapaca woodland, littoral rainforest, and tropical dry forest (Fig.
Three generalized morphotypes can be distinguished within this taxon; these vary in density of cephalic foveae and other co-occurring traits (Fig.
A, B, C Head in full-face view displaying variation in P. descarpentriesi for cephalic sculpture. A (CASENT0034837) “morphotype-A” B (CASENT0480792) “morphotype-B” C (CASENT0191895) “morphotype-C”.
P. descarpentriesi is much more morphologically variable than the other species treated in this revision and very possibly represents a species complex. This could explain why P. descarpentriesi is abundant, geographically widespread, and morphologically variable. Morphotype C, which is restricted to a band bordering the coast of eastern and northern Madagascar (Fig.
Under the above scheme, the lectotype and paralectotype of P. descarpentriesi would be considered morphotype A. Jules Descarpentries (1881–1927) collected the types for this species on 30 September 1923 and the collection locale was subsequently noted as “Ikelivia”, making it difficult to determine a more precise location based on modern place names. Historical records indicate that Descarpentries resided in Tulear, and worked as a topographic surveyor and entomologist. According to records, he was active around Tsaratanana and Fianarantsoa (specifically Andringitra) and often traveled with H. Perrier de la Bâthie. Given that morphotype A is reasonably widespread across Madagascar, including Tsaratanana and Andringitra, it is possible that the type specimens from “Ikelivia” were collected in either of these localities. To further complicate matters, most of Descarpentries’s specimens, which were destined to the Paris Museum, were sold on the side by a member of the staff. Before the specimens were sold, the labels were changed to hide their true ordinance (
MADAGASCAR: Antananarivo, Ankalalahana, 19.0066°S, 47.1122°E, 1375 m, Uapaca woodland, 29.iii.2011 (B.L.Fisher et al.); Antananarivo, Forêt de galerie, Andranorovitra, 24.0 km NNE Ankazobe, 18.1124°S, 47.1976°E, 1491 m, disturbed gallery montane forest, 2.vi.2008 (B.L.Fisher et al.); Antananarivo, Navoatra I Non Protected Area, 7.64 km NW Arivonimamo, 18.9781°S, 47.1193°E, 1373 m, Uapaca woodland, 6.v.2010 (Andrianjaka Ravelomanana); Antananarivo, Réserve Naturelle Sohisika, Sohisika 24.6 km NNE Ankazobe, 18.1032°S, 47.1869°E, 1464 m, gallery montane forest, 1.vi.2008 (B.L.Fisher et al.); Antananarivo, Réserve Spéciale d’Ambohitantely, 18.2244°S, 47.2774°E, 1490 m, montane forest, 9.iii.2012 (B.L.Fisher et al.); Antananarivo, Réserve Spéciale d’Ambohitantely, Forêt d’Ambohitantely, 20.9 km 72° NE d’Ankazobe, 18.2253°S, 47.2868°E, 1410 m, montane rainforest, 17.iv.2001 (Fisher, Griswold et al.); Antananarivo, Réserve Spéciale d’Ambohitantely, Forêt d’Ambohitantely, Jardin Botanique, 24.1 km 59° NE d’Ankazobe, 18.1714°S, 47.2818°E, 1620 m, montane rainforest, 17.iv.2001 (Fisher, Griswold et al.); Antananarivo, Tsimbazaza, 18.928°S, 47.527°E, 1300 m, park/garden, 16.xii.2006 (B.L.Fisher et al.); Antsiranana, 6.5 km SSW Befingotra, Rés. Anjanaharibe-Sud, 14.75°S, 49.5°E, 875 m, rainforest, 19.x.1994 (B.L.Fisher); Antsiranana, 9.2 km WSW Befingotra, Rés. Anjanaharibe-Sud, 14.75°S, 49.4667°E, 1280 m, montane rainforest, 5.xi.1994 (B.L.Fisher); Antsiranana, Ambondrobe, 41.1 km 175° Vohemar, 13.7153°S, 50.1017°E, 10 m, littoral rainforest, 29.xi.2004 (B.L.Fisher); Antsiranana, Ampasindava, Andranomatavy Forest, 13.669°S, 47.9877°E, 149 m, disturbed dry forest, 6.x.2013 (B.L.Fisher et al.); Antsiranana, Ampasindava, Andranomatavy Forest, 13.663°S, 47.9794°E, 543 m, disturbed dry forest, 6.x.2013 (B.L.Fisher et al.); Antsiranana, Binara Forest, 13.2621°S, 49.6067°E, 559 m, degraded rainforest, 18.x.2013 (B.L.Fisher et al.); Antsiranana, Binara Forest, 13.2621°S, 49.605°E, 692 m, rainforest, 18.x.2013 (B.L.Fisher et al.); Antsiranana, Binara Forest, 13.2639°S, 49.5992°E, 1065 m, rainforest, 18.x.2013 (B.L.Fisher et al.); Antsiranana, Forêt Ambanitaza, 26.1 km 347° Antalaha, 14.6793°S, 50.1837°E, 240 m, rainforest, 26.xi.2004 (B.L.Fisher); Antsiranana, Forêt d’ Andavakoera, 21.4 km 75° ENE Ambilobe; 4.6 km 356° N Betsiaka, 13.1183°S, 49.23°E, 425 m, rainforest, 15.xii.2003 (B.L.Fisher); Antsiranana, Forêt d’ Antsahabe, 11.4 km 275° W Daraina, 13.2117°S, 49.5567°E, 550 m, tropical dry forest, 12.xii.2003 (B.L.Fisher); Antsiranana, Forêt d’Ampondrabe, 26.3 km 10° NNE Daraina, 12.97°S, 49.7°E, 175 m, tropical dry forest, 10.xii.2003 (B.L.Fisher); Antsiranana, Forêt de Bekaraoka, 6.8 km 60° ENE Daraina, 13.1667°S, 49.71°E, 150 m, tropical dry forest, 7.xii.2003 (B.L.Fisher); Antsiranana, Forêt de Binara, 7.5 km 230° SW Daraina, 13.255°S, 49.6167°E, 375 m, tropical dry forest, 1.xii.2003 (B.L.Fisher); Antsiranana, Forêt de Binara, 9.1 km 233° SW Daraina, 13.2633°S, 49.6033°E, 800 m, rainforest, 3.xii.2003 (B.L.Fisher); Antsiranana, Forêt de Binara, 9.4 km 235° SW Daraina, 13.2633°S, 49.6°E, 1100 m, montane rainforest, 5.xii.2003 (B.L.Fisher); Antsiranana, Galoko chain, Mont Galoko, 13.5936°S, 48.7316°E, 1100 m, montane forest, 22.ii.2013 (B.L.Fisher et al.); Antsiranana, Galoko chain, Mont Galoko, 13.5888°S, 48.7286°E, 980 m, montane forest, 22.ii.2013 (B.L.Fisher et al.); Antsiranana, Galoko chain, Mont Galoko, 13.5849°S, 48.7182°E, 520 m, rainforest, 16.ii.2013 (B.L.Fisher et al.); Antsiranana, Galoko chain, Mont Kalabenono, 13.6418°S, 48.6728°E, 643 m, rainforest, 10.x.2013 (B.L.Fisher et al.); Antsiranana, Galoko chain, Mont Kalabenono, 13.64°S, 48.6737°E, 498 m, rainforest, 10.x.2013 (B.L.Fisher et al.); Antsiranana, Galoko chain, Mont Kalabenono, 13.6461°S, 48.6773°E, 937 m, rainforest, 10.x.2013 (B.L.Fisher et al.); Antsiranana, Makirovana forest, 14.1604°S, 49.9522°E, 550 m, rainforest, 1.v.2011 (B.L.Fisher et al.); Antsiranana, Makirovana forest, 14.1651°S, 49.9477°E, 900 m, montane rainforest, 30.iv.2011 (B.L.Fisher et al.); Antsiranana, Makirovana forest, 14.1667°S, 49.95°E, 715 m, rainforest, 1.v.2011 (B.L.Fisher et al.); Antsiranana, Makirovana forest, 14.1707°S, 49.9541°E, 415 m, rainforest, 28.iv.2011 (B.L.Fisher et al.); Antsiranana, Parc National de Marojejy, Antranohofa, 26.6 km 31° NNE Andapa, 10.7 km 318° NW Manantenina, 14.4433°S, 49.7433°E, 1325 m, montane rainforest, 18.xi.2003 (B.L.Fisher); Antsiranana, Parc National de Marojejy, Manantenina River, 27.6 km 35° NE Andapa, 9.6 km 327° NNW Manantenina, 14.435°S, 49.76°E, 775 m, rainforest, 15.xi.2003 (B.L.Fisher et al.); Antsiranana, Parc National de Marojejy, Manantenina River, 28.0 km 38° NE Andapa, 8.2 km 333° NNW Manantenina, 14.4367°S, 49.775°E, 450 m, rainforest, 12.xi.2003 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, 12.2 km 211° SSW Joffreville, 12.5964°S, 49.1595°E, 1300 m, montane rainforest, 2.ii.2001 (Fisher, Griswold et al.); Antsiranana, Parc National Montagne d’Ambre, 3.6 km 235° SW Joffreville, 12.5344°S, 49.1795°E, 925 m, montane rainforest, 20.i.2001 (Fisher, Griswold et al.); Antsiranana, Prov.Antsiranana R.S. Manongarivo 17.3 km 218° SW Antanambao, 14.0217°S, 48.4183°E, 1580 m, montane rainforest, 27.x.1998 (B.L.Fisher); Antsiranana, R.S. Manongarivo, 10.8 km 229° SW Antanambao, 13.9617°S, 48.4333°E, 400 m, rainforest, 8.xi.1998 (B.L.Fisher); Antsiranana, R.S. Manongarivo, 12.8 km 228° SW Antanambao, 13.9767°S, 48.4233°E, 780 m, rainforest, 11.x.1998 (B.L.Fisher); Antsiranana, R.S. Manongarivo, 14.5 km 220° SW Antanambao, 13.9983°S, 48.4283°E, 1175 m, montane rainforest, 20.x.1998 (B.L.Fisher); Antsiranana, R.S. Manongarivo, 20.4 km 219° SW Antanambao, 14.0467°S, 48.4017°E, 1860 m, montane rainforest, 3.xi.1998 (B.L.Fisher); Fianarantsoa, 28 km. SSW Ambositra, Ankazomivady, 20.775°S, 47.1683°E, 1670 m, grassland, 11.i.1998 (B.L.Fisher); Fianarantsoa, 3 km W Ranomafana, nr. Ifandiana, 21.25°S, 47.4167°E, 950 m, forest, 27.iv.1989 (P.S.Ward); Fianarantsoa, 43 km S Ambalavao, Rés. Andringitra, 22.2333°S, 47°E, 825 m, rainforest, 5.x.1993 (B.L.Fisher); Fianarantsoa, 45 km S. Ambalavao, 22.2167°S, 47.0167°E, 785 m, rainforest, 25.ix.1993 (B.L.Fisher); Fianarantsoa, 7.6 km 122º Kianjavato, Forêt Classée Vatovavy, 21.4°S, 47.94°E, 175 m, rainforest, 6.vi.2005 (B.L.Fisher et al.); Fianarantsoa, 9.0 km NE Ivohibe, 22.4267°S, 46.9383°E, 900 m, rainforest, 12.xi.1997 (B.L.Fisher (Sylvain)); Fianarantsoa, Ampangabe I Non Protected Area, 21.4 km W Itremo, 20.6111°S, 46.6069°E, 1414 m, savannah woodland, 21.iii.2010 (Andrianjaka Ravelomanana); Fianarantsoa, Antapia I Non Protected Area, 26.43 km SW Ambositra, 20.7197°S, 47.0868°E, 1495 m, Uapaca woodland, 3.ii.2010 (Andrianjaka Ravelomanana); Fianarantsoa, Antohatsahomby V Non Protected Area, 22.63 km NW Itremo, 20.5672°S, 46.5792°E, 1726 m, Uapaca woodland, 18.iii.2010 (Andrianjaka Ravelomanana); Fianarantsoa, Forêt d’Atsirakambiaty, 7.6 km 285° WNW Itremo, 20.5933°S, 46.5633°E, 1550 m, montane rainforest, 22.i.2003 (Fisher, Griswold et al.); Fianarantsoa, Mampiarika I Non Protected Area, 28.08 km SW Ambositra, 20.7344°S, 47.0836°E, 1480 m, Uapaca woodland, 31.i.2010 (Andrianjaka Ravelomanana); Fianarantsoa, Mampiarika III Non Protected Area, 28.93 km SW Ambositra, 20.7358°S, 47.084°E, 1487 m, Uapaca woodland, 1.ii.2010 (Andrianjaka Ravelomanana); Fianarantsoa, Parc National Befotaka-Midongy, Papango 27.7 km S Midongy-Sud, Mount Papango, 23.8352°S, 46.9637°E, 940 m, rainforest, 13.xi.2006 (B.L.Fisher et al.); Fianarantsoa, Parc National d’Isalo, 9.1 km 354° N Ranohira, 22.4817°S, 45.4617°E, 725 m, gallery forest, 27.i.2003 (Fisher, Griswold et al.); Fianarantsoa, Parc National de Ranomafana, Vatoharanana River, 4.1 km 231° SW Ranomafana, 21.29°S, 47.4333°E, 1100 m, montane rainforest, 27.iii.2003 (Fisher, Griswold et al.); Fianarantsoa, Parc Nationale Ranomafana: Talatakely, 21.2483°S, 47.4267°E, in guava forest, 9.iv.1998 (CE Griswold, DH Kavanaugh, ND Penny, MJ Raherilalao, JS Ranorianarisoa, J Schwei); Fianarantsoa, R.S. Ivohibe, 7.5 km ENE Ivohibe, 22.47°S, 46.96°E, 900 m, rainforest, 7.x.1997 (B.L.Fisher (Sylvain)); Fianarantsoa, Réserve Forestière d’Agnalazaha, Mahabo, 42.9 km 215° Farafangana, 23.1938°S, 47.723°E, 20 m, littoral rainforest, 19.iv.2006 (B.L. Fisher et al.); Fianarantsoa, Soanierenana I Non Protected Area, 25.33 km SW Ambositra, 20.7214°S, 47.1099°E, 1723 m, savannah grassland, 6.ii.2010 (Andrianjaka Ravelomanana); Mahajanga, Réserve Spéciale Marotandrano, Marotandrano 48.3 km S Mandritsara, 16.2832°S, 48.8144°E, 865 m, transition humid forest, 6.xii.2007 (B.L.Fisher et al.); Toamasina, 16 km S Moramanga, 19.0833°S, 48.2333°E, 950 m, rainforest, 18.xi.1990 (P. S. Ward); Toamasina, 19 km ESE Maroantsetra, 15.4833°S, 49.9°E, 350 m, rainforest, 22.iv.1989 (P. S. Ward); Toamasina, 5.3 km SSE Ambanizana, Andranobe, 15.6713°S, 49.974°E, 425 m, rainforest, 19.xi.1993 (B.L.Fisher); Toamasina, 6.3 km S Ambanizana, Andranobe, 15.6813°S, 49.958°E, 25 m, rainforest, 14.xi.1993 (B.L.Fisher); Toamasina, 6.9 km NE Ambanizana, Ambohitsitondroina, 15.5851°S, 50.0095°E, 825 m, rainforest, 2.xii.1993 (B.L.Fisher); Toamasina, Ambanizana, Parc National Masoala, 15.5717°S, 50.0061°E, 925 m, montane rainforest, 26.ii.2003 (D. Andriamalala, D. Silva, et al.); Toamasina, Ambatovy, 12.4 km NE Moramanga, 18.8496°S, 48.2947°E, 1010 m, montane rainforest, 3.iii.2007 (B.L.Fisher et al.); Toamasina, Ambatovy, 12.4 km NE Moramanga, 18.8394°S, 48.3084°E, 1080 m, montane rainforest, 4.iii.2007 (B.L.Fisher et al.); Toamasina, Analamay, 18.8062°S, 48.3371°E, 1068 m, montane rainforest, 21.iii.2004 (Malagasy ant team); Toamasina, Corridor Forestier Analamay-Mantadia, Ambatoharanana, 18.8042°S, 48.4008°E, 968 m, rainforest, 12.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambohibolakely, 18.779°S, 48.3638°E, 918 m, rainforest, 23.xi.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Tsaravoniana, 18.7612°S, 48.4213°E, 939 m, rainforest, 2.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Tsaravoniana, 18.7646°S, 48.4194°E, 1039 m, rainforest, 2.xii.2012 (B.L.Fisher et al.); Toamasina, Forêt Ambatovy, 14.3 km 57° Moramanga, 18.8508°S, 48.32°E, 1075 m, montane rainforest, 21.iii.2004 (Malagasy ant team); Toamasina, Ile Sainte Marie, Forêt Kalalao, 9.9 km 34° Ambodifotatra, 16.9225°S, 49.8873°E, 100 m, rainforest, 24.xi.2005 (B.L.Fisher et al.); Toamasina, Montagne d’Akirindro 7.6 km 341° NNW Ambinanitelo, 15.2883°S, 49.5483°E, 600 m, rainforest, 17.iii.2003 (Fisher, Griswold et al.); Toamasina, Montagne d’Anjanaharibe, 18.0 km 21° NNE Ambinanitelo, 15.1883°S, 49.615°E, 470 m, rainforest, 8.iii.2003 (Fisher, Griswold et al.); Toamasina, Montagne d’Anjanaharibe, 19.5 km 27° NNE Ambinanitelo, 15.1783°S, 49.635°E, 1100 m, montane rainforest, 12.iii.2003 (Fisher, Griswold et al.); Toamasina, Parc National de Zahamena, Onibe River, 17.7591°S, 48.8547°E, 780 m, rainforest, 21.ii.2009 (B.L.Fisher et al.); Toamasina, Parc National de Zahamena, Tetezambatana forest, near junction of Nosivola and Manakambahiny Rivers, 17.743°S, 48.7294°E, 860 m, rainforest, 18.ii.2009 (B.L.Fisher et al.); Toamasina, Parc National Mananara-Nord, 7.1 km 261° Antanambe, 16.455°S, 49.7875°E, 225 m, rainforest, 14.xi.2005 (B.L.Fisher et al.); Toamasina, Parcelle K7 Tampolo, 17.2833°S, 49.4167°E, 10 m, littoral forest, 16.iv.2004 (Malagasy ant team); Toamasina, Parcelle K9 Tampolo, 17.175°S, 49.268°E, 10 m, littoral forest, 19.iv.2004 (Malagasy ant team); Toamasina, Res. Ambodiriana, 4.8 km 306°Manompana, along Manompana river, 16.6723°S, 49.7012°E, 125 m, rainforest, 18.xi.2005 (B.L.Fisher et al.); Toamasina, Reserve Betampona, Camp Vohitsivalana, 37.1 km 338° Toamasina, 17.8867°S, 49.2025°E, 520 m, rainforest, 1.xii.2005 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.8175°S, 49.295°E, 360 m, rainforest, 25.ii.2010 (B.L.Fisher et al.); Toamasina, S.F. Tampolo, 10 km NNE Fenoarivo Atn., 17.2825°S, 49.43°E, 10 m, littoral rainforest, 4.iv.1997 (B.L.Fisher); Toamasina, Sahafina forest 11.4 km W Brickaville, 18.8145°S, 48.962°E, 140 m, rainforest, 13.xii.2007 (B.L.Fisher et al.); Toamasina, Torotorofotsy, 18.8708°S, 48.3474°E, 1070 m, montane rainforest, marsh edge, 24.iii.2004 (Malagasy ant team); Toliara, 10 km NW Enakara, Rés. Andohahela, 24.5667°S, 46.8167°E, 430 m, rainforest, 22.xi.1992 (B.L.Fisher); Toliara, 11 km NW Enakara, Rés. Andohahela, 24.5667°S, 46.8333°E, 800 m, rainforest, 17.xi.1992 (B.L.Fisher); Toliara, 2.7 km WNW 302° Ste. Luce, 24.7717°S, 47.1717°E, 20 m, littoral rainforest, 9.xii.1998 (B.L.Fisher (J.-Baptiste)); Toliara, Anosy Region, Distric of Amboasary, 58Km SW of Fort Dauphin, 08 Km NW of Amboasary, Berenty Special Reserve, 25.0067°S, 46.3033°E, 85 m, Galery forest, 25.v.2003 (Rin’ha, Mike); Toliara, Forêt Classée d’Analavelona, 29.2 km 343° NNW Mahaboboka, 22.675°S, 44.19°E, 1100 m, montane rainforest, 18.ii.2003 (Fisher, Griswold et al.); Toliara, Forêt Classée d’Analavelona, 29.4 km 343° NNW Mahaboboka, 22.675°S, 44.1867°E, 1050 m, montane rainforest, 21.ii.2003 (Fisher, Griswold et al.); Toliara, Forêt Ivohibe 55.6 km N Tolagnaro, 24.5617°S, 47.2002°E, 650 m, rainforest, 4.xii.2006 (B.L.Fisher et al.); Toliara, Grand Lavasoa, 25.9 km W Tolagnaro, 25.0877°S, 46.749°E, 450 m, rainforest, 30.xi.2006 (B.L.Fisher et al.); Toliara, Mandena, 8.4 km NNE 30° Tolagnaro, 24.9517°S, 47.0017°E, 20 m, littoral rainforest, 20.xi.1998 (B.L.Fisher); Toliara, Parc National Andohahela, Col de Tanatana, 33.3 km NW Tolagnaro, 24.7585°S, 46.8537°E, 275 m, rainforest, 22.xi.2006 (B.L.Fisher et al.); Toliara, Rés. Andohahela, 6 km SSW Eminiminy, 24.7333°S, 46.8°E, 330 m, rainforest, 4.ii.1993 (P. S. Ward); Toliara, Réserve Spéciale d’Ambohijanahary, Forêt d’Ankazotsihitafototra, 34.6 km 314° NW Ambaravaranala, 18.26°S, 45.4183°E, 1100 m, montane rainforest, 16.i.2003 (Fisher, Griswold et al.); Toliara, Réserve Spéciale d’Ambohijanahary, Forêt d’Ankazotsihitafototra, 35.2 km 312° NW Ambaravaranala, 18.2667°S, 45.4067°E, 1050 m, montane rainforest, 13.i.2003 (Fisher, Griswold et al.); Toliara, Réserve Spéciale Kalambatritra, Ampanihy, 23.4635°S, 46.4631°E, 1270 m, montane rainforest, 9.ii.2009 (B.L.Fisher et al.); Bongolava Prefec. de Tsiroanomandidy, 6.xii.1974 (A.Peyrieras).
Holotype, pinned worker, MADAGASCAR, Antsiranana, Parc National de Marojejy, Manantenina River, 28.0 km 38° NE Andapa, 8.2 km 333° NNW Manantenina, 14.43667°S, 49.775°E, 450 m, rainforest, sifted litter (leaf mold, rotten wood), collection code: BLF08722, 12.xi.2003 (B.L. Fisher et al.) (CASC: CASENT0046149). Paratypes, nine pinned workers with same data as holotype (BMNH: CASENT0046153; CASC: CASENT0046141; CASENT0046142; CASENT0046143; CASENT0046147; CASENT0046151; MCZC: CASENT0046150; MHNG: CASENT0046140; NHMB: CASENT0046148).
P. laurae is the only Malagasy Prionopelta with workers that possess nine antennal segments (all others possess twelve). Additionally, it is the smallest of all the Malagasy species with HL < 0.4 mm and HW < 0.3 mm (HL and HW of all other species is greater than 0.4 mm and 0.3 mm respectively).
(N=16). HL 0.33–0.38 (0.35); HW 0.24–0.27 (0.26); SL 0.16–0.18 (0.17); WL 0.34–0.4 (0.38); PetL 0.09–0.11 (0.1); PetW 0.13–0.15 (0.14); T1W 0.19–0.23 (0.21); CI 67.55–75.64 (72.71); PI 120.18–152.75 (135.44); SI 61.62–69.05 (65.06).
Head much longer than wide with lowest cephalic index on average of all Malagasy Prionopelta (mean CI 72.71); posterior head margin straight in full-face view; cephalic foveae small and very dense, with no space for additional cephalic foveae present; median cephalic band devoid of foveae is long and thin and appears slightly swollen or raised above the surrounding integument, forming a scarlike suture; apical tooth of the mandible over four times the length of third tooth in full-face view; nine antennal segments; eye greatly reduced, appearing as a tiny, dark gray patch; majority of marks on pronotum are densely spaced, tiny punctures; mesonotum and propodeum consisting of tiny shallow foveae; metanotal groove visible dorsally; smallest of the Prionopelta from Malagasy region; body distinctly pale yellow in color.
The name of this species is a patronym dedicated to Laura D. Steger for her continual support during the course of this work and her either completely genuine—or expertly feigned—enthusiasm for being endlessly bombarded by information about ants.
This species has been collected in leaf litter primarily in rainforest with some collections from littoral rainforest and one in tropical dry rainforest, at elevations between 10–600 meters. Its range is restricted to eastern Madagascar and is seemingly disjunct, with most individuals collected from the northeast and only two locales known from the southeast near the coast. No individuals have been collected between Sahafina Forest in the north and Mahabo forest in the south, a distance of 500 km (Fig.
This species of Prionopelta is unmistakable as it is the only Malagasy species with nine antennal segments. It is also the smallest known species of Malagasy Prionopelta and is a distinct pale yellow color, which is much lighter than the fully-sclerotized workers of any other Malagasy species.
P. laurae paratype worker (CASENT0046151). A Head in full-face view B Body in profile C Body in dorsal view.
MADAGASCAR: Antsiranana, Ambondrobe, 41.1 km 175° Vohemar, 13.7153°S, 50.1017°E, 10 m, littoral rainforest, 29.xi.2004 (B.L.Fisher); Antsiranana, Forêt Ambanitaza, 26.1 km 347° Antalaha, 14.6793°S, 50.1837°E, 240 m, rainforest, 26.xi.2004 (B.L.Fisher); Antsiranana, Forêt de Binara, 7.5 km 230° SW Daraina, 13.255°S, 49.6167°E, 375 m, tropical dry forest, 1.xii.2003 (B.L.Fisher); Fianarantsoa, Réserve Forestière d’Agnalazaha, Mahabo, 42.9 km 215° Farafangana, 23.1938°S, 47.723°E, 20 m, littoral rainforest, 19.iv.2006 (B.L. Fisher et al.); Toamasina, 19 km ESE Maroantsetra, 15.4833°S, 49.9°E, 350 m, rainforest, 22.iv.1989 (P. S. Ward); Toamasina, Montagne d’Akirindro 7.6 km 341° NNW Ambinanitelo, 15.2883°S, 49.5483°E, 600 m, rainforest, 17.iii.2003 (Fisher, Griswold et al.); Toamasina, Nosy Mangabe, 15.5°S, 49.7667°E, 300 m, rainforest, 18.iv.1989 (P. S. Ward); Toamasina, Parc National Mananara-Nord, 7.1 km 261° Antanambe, 16.455°S, 49.7875°E, 225 m, rainforest, 14.xi.2005 (B.L.Fisher et al.); Toamasina, Reserve Betampona, Camp Rendrirendry 34.1 km 332° Toamasina, 17.924°S, 49.1997°E, 390 m, rainforest, 28.xi.2005 (B.L.Fisher et al.); Toamasina, Reserve Betampona, Camp Vohitsivalana, 37.1 km 338° Toamasina, 17.8867°S, 49.2025°E, 520 m, rainforest, 1.xii.2005 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.7727°S, 49.2655°E, 450 m, rainforest, 20.ii.2010 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.8175°S, 49.295°E, 360 m, rainforest, 25.ii.2010 (B.L.Fisher et al.); Toamasina, Sahafina forest 11.4 km W Brickaville, 18.8145°S, 48.962°E, 140 m, rainforest, 13.xii.2007 (B.L.Fisher et al.); Toliara, 2.7 km WNW 302° Ste. Luce, 24.7717°S, 47.1717°E, 20 m, littoral rainforest, 9.xii.1998 (B.L.Fisher, J.-Baptiste).
Holotype, pinned worker, SEYCHELLES, Silhouette Island, ridge from Mont Corgat to Mont Cocos Marrons, 4.50126°S, 55.23985°E, 455 m, forest, sifted litter (leaf mold, rotten wood), collection code BLF23364, 24.ii.2010 (B.L. Fisher et al.) (CASC: CASENT0161311). Paratypes, eight pinned workers with same data as holotype (BMNH: CASENT0161314; CASC: CASENT0161310; CASENT0161312; CASENT0161313; CASENT0161315; CASENT0161316; CASENT0161317; CASENT0161319).
P. seychelles is the only known species from Seychelles. It can be distinguished from all other Malagasy Prionopelta through the following characters: twelve antennal segments; densely arranged cephalic foveae with virtually no space for additional foveae and no shining integument visible between; pronotum consisting of shallow foveae much larger in diameter than those on the head with punctures between; median cephalic band which is devoid of foveae not swelling above the surrounding integument, and often characterized as being wider anteriorly and narrower posteriorly.
(N=15). HL 0.44–0.48 (0.46); HW 0.33–0.37 (0.35); SL 0.22–0.26 (0.24); WL 0.47–0.54 (0.5); PetL 0.13–0.17 (0.14); PetW 0.17–0.21 (0.18); T1W 0.29–0.31 (0.3); CI 73.63–80.41 (76.39); PI 106.92–144.44 (128.7); SI 64.56–73.43 (69.77).
Twelve antennal segments; posterior margin of the head weakly concave in full-face view; small cephalic foveae densely positioned so that no flat, shining integument is present between; median cephalic band which is devoid of foveae does not appear to swell above the surrounding integument, but rather appears as a smooth, shining surface which is widest anteriorly, narrowing posteriorly; apical tooth intermediate in length; pronotum with foveae which range from shallow to deep and are interspersed regularly with punctures; mesonotum and propodeum consisting of large, shallow foveae; metanotal groove strongly visible, and mesopropodeal suture visible to barely visible, but some depression always present; posterior propodeal edge viewed dorsally is straight or only very slightly concave; no protruding lamellae of the posterior propodeum.
This species is named after the Seychelles archipelago, to which it is endemic. The species epithet is a noun in apposition, and thus invariable.
This species is known only from Seychelles and is found between 15–660 meters of elevation on the islands of Mahé, Conception, Thérèse, Silhouette, Praslin, La Digue, Félicité Island, and the Little Sister island group. It does not appear to have strict habitat preferences as it has been collected in mixed forest, littoral forest, non-native forest, palm forest, and coastal scrub. P. seychelles has also been collected from a diversity of microhabitats including from leaf litter, inside rotten logs, under rocks, under moss on live trees, and under root mats.
P. seychelles is most likely to be confused with P. subtilis, as both have very small cephalic foveae that are densely arranged on the head. However, the two species are not sympatric, as P. seychelles is known only from Seychelles, and P. subtilis only from Madagascar. The median cephalic bands contrast markedly between these taxa, as that of P. seychelles is wide anteriorly, often tapering posteriorly, with an interrupted border caused by aberrantly placed foveae which break up the margins which define the smooth shining area (Fig.
P. seychelles paratype worker (CASENT0161319). A Head in full-face view B Body in profile C Body in dorsal view.
SEYCHELLES: Conception Island, 4.6631°S, 55.3682°E, 65 m, mixed forest, 12.ii.2010 (B.L.Fisher et al.); Félicité Island, 4.3258°S, 55.8698°E, 120 m, forest, 1.ii.2010 (B.L.Fisher et al.); La Digue Island, 4.3561°S, 55.8433°E, 300 m, forest, 31.i.2010 (B.L.Fisher et al.); La Digue Island, Veuve Réserve, 4.357°S, 55.8279°E, 15 m, littoral forest, 2.ii.2010 (B.L.Fisher et al.); Mahé Island, Casse Dent, Morne Seychellois National Park, 4.6528°S, 55.4374°E, 465 m, mixed forest, 11.ii.2010 (B.L.Fisher et al.); Mahé Island, Morne Blanc, 4.6574°S, 55.4333°E, 660 m, mixed forest near glacis, 10.ii.2010 (B.L.Fisher et al.); Mare Aux Cochon, Mahé Island, 30.vii.2002 (J. Gerlach); Praslin Island, 4.3546°S, 55.748°E, 25 m, coastal scrub, 6.ii.2010 (B.L.Fisher et al.); Praslin Island, Praslin tower, 4.3409°S, 55.7451°E, 370 m, mixed forest, 3.ii.2010 (B.L.Fisher et al.); Praslin Island, Vallée de Mai, 4.331°S, 55.7389°E, 200 m, palm forest, 2.ii.2010 (B.L.Fisher et al.); Silhouette Island, above Jardin Marron on crest to Mont Plaisir and Pot à Eau, 4.4867°S, 55.2341°E, 520 m, forest, 20.i.2010 (B.L.Fisher et al.); Silhouette Island, Gratte Fesse, 4.4917°S, 55.2389°E, 450 m, forest, 6.iv.2009 (J. Gerlach); Silhouette Island, Jardin Marron, 4.4864°S, 55.2363°E, 395 m, non native forest, 27.i.2010 (B.L.Fisher et al.); Silhouette Island, Jardin Marron, 4.4864°S, 55.2364°E, 390 m, 24.iii.2009 (J. Gerlach); Silhouette Island, La Passe, 4.4847°S, 55.2508°E, 20 m, park/garden, 12.vii.2001 (J. Gerlach); Silhouette Island, on path to Anse Mondon, 4.4689°S, 55.2294°E, 255 m, forest, 23.i.2010 (B.L.Fisher et al.); Silhouette Island, on plateau toward Gratte Fesse, 4.4879°S, 55.2342°E, 490 m, forest, 22.i.2010 (B.L.Fisher et al.).
Holotype, pinned worker, MADAGASCAR, Toamasina, Montagne d’Anjanaharibe, 18.0 km 21° NNE Ambinanitelo, 15.18833°S, 49.615°E, 470 m, rainforest, sifted litter (leaf mold, rotten wood), BLF08002, 8.iii.2003 (B.L. Fisher et al.) (CASC: CASENT0033641). Paratypes, 23 pinned workers with same data as holotype (BMNH: CASENT0033585; CASC: CASENT0033582; CASENT0033586; CASENT0033588; CASENT0033590; CASENT0033591; CASENT0033596; CASENT0033597; CASENT0033598; CASENT0033599; CASENT0033600; CASENT0033601; CASENT0033603; CASENT0033606; CASENT0033610; CASENT0033611; CASENT0033613; CASENT0033614; CASENT0033615; CASENT0033644; MCZC: CASENT0033604; MHNG: CASENT0033584; NHMB: CASENT0033643).
P. subtilis can be recognized by the following combination of characters: twelve antennal segments; minute, densely placed cephalic foveae with raised margins where foveae touch so that the entire head is covered in a delicate mosaic of connected foveae with ridges between; well-defined, uniformly narrow, coronal suture that swells above the level of the surrounding integument; shallow foveae on the pronotum are much larger than those on the head, and more widely spaced, with tiny punctures between.
(N=20). HL 0.47–0.57 (0.52); HW 0.39–0.45 (0.42); SL 0.26–0.32 (0.29); WL 0.5–0.67 (0.58); PetL 0.14–0.18 (0.16); PetW 0.19–0.26 (0.22); T1W 0.31–0.4 (0.35); CI 76.55–86.41 (80.5); PI 126.32–150.69 (139.98); SI 61.34–71.39 (68.14).
Posterior head margin slightly concave with a noticeable notch medially; cephalic foveae dense and minute; virtually no area of the head lacking foveae in full-face view except at the extreme posterolateral corners; median cephalic band devoid of foveae is thin, linear, and slightly but uniformly swells above the surrounding integument; apical tooth intermediate in length; foveae on the pronotum are shallow, as well as more widely spaced and obviously larger than those on the head, with punctures present between; mesonotum and propodeum consisting of shallow foveae and punctures; metanotal groove visible dorsally, and mesopropodeal suture strongly visible in lateral view.
The name of this species comes from the Latin adjective meaning “fine”, “thin”, or “slender” and refers to the very delicate, net-like patterns produced by the sculpture on the head.
This common and widespread species is found in rainforest, montane rainforest, lowland rainforest, tropical forest, littoral forest, degraded forest, and marsh edge from 5–1325 meters of elevation (Fig.
P. subtilis is easy to recognize at a glance under high magnification once several individuals have been observed, as the very small and delicate foveae covering the entire surface of the head produce a unique visual appearance among the Malagasy Prionopelta. The only other confusable species with dense, directly adjacent foveae across the entire head (besides P. laurae, which would not be mistaken for P. subtilis) are P. seychelles, and some P. descarpentriesi. Unlike P. subtilis, P. seychelles does not possesses a coronal suture medially on the head. Some individuals of P. descarpentriesi have a dense pattern of touching foveae with a network of ridges between them across the entire head, but these foveae are much larger and deeper than in P. subtilis. Additionally, this trait in P. descarpentriesi is accompanied by sculpture on the pronotum that consists almost entirely of large foveae which are similar in size to those on the head, whereas P. subtilis has much larger foveae on its pronotum than on its head, and these foveae are interspersed with punctures.
P. subtilis holotype worker (CASENT0033641). A Head in full-face view B Body in profile C Body in dorsal view.
MADAGASCAR: Andasibe, Mantadia NP, 7.i.2006 (A.Ballerio); Antsiranana, 6.5 km SSW Befingotra, Rés. Anjanaharibe-Sud, 14.75°S, 49.5°E, 875 m, rainforest, 19.x.1994 (B.L.Fisher); Antsiranana, 9.2 km WSW Befingotra, Rés. Anjanaharibe-Sud, 14.75°S, 49.4667°E, 1200 m, montane rainforest, 9.xi.1994 (B.L.Fisher); Antsiranana, Betaolana Forest, along Bekona River, 14.53°S, 49.4404°E, 880 m, rainforest, 4.iii.2009 (B.L.Fisher et al.); Antsiranana, Binara Forest, 13.2639°S, 49.5992°E, 1065 m, rainforest, 18.x.2013 (B.L.Fisher et al.); Antsiranana, Forêt de Binara, 9.4 km 235° SW Daraina, 13.2633°S, 49.6°E, 1100 m, montane rainforest, 5.xii.2003 (B.L.Fisher); Antsiranana, Makirovana forest, 14.1651°S, 49.9477°E, 900 m, montane rainforest, 30.iv.2011 (B.L.Fisher et al.); Antsiranana, Makirovana forest, 14.1667°S, 49.95°E, 715 m, rainforest, 2.v.2011 (B.L.Fisher et al.); Antsiranana, Makirovana forest, 14.1604°S, 49.9522°E, 550 m, rainforest, 1.v.2011 (B.L.Fisher et al.); Antsiranana, Makirovana forest, 14.1707°S, 49.9541°E, 415 m, rainforest, 29.iv.2011 (B.L.Fisher et al.); Antsiranana, Parc National de Marojejy, Antranohofa, 26.6 km 31° NNE Andapa, 10.7 km 318° NW Manantenina, 14.4433°S, 49.7433°E, 1325 m, montane rainforest, 18.xi.2003 (B.L.Fisher); Antsiranana, Parc National de Marojejy, Manantenina River, 27.6 km 35° NE Andapa, 9.6 km 327° NNW Manantenina, 14.435°S, 49.76°E, 775 m, rainforest, 15.xi.2003 (B.L.Fisher et al.); Antsiranana, Parc National de Marojejy, Manantenina River, 28.0 km 38° NE Andapa, 8.2 km 333° NNW Manantenina, 14.4367°S, 49.775°E, 450 m, rainforest, 12.xi.2003 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, 12.5178°S, 49.1796°E, 1000 m, montane rainforest, 4.iii.2011 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, 12.5139°S, 49.1778°E, 984 m, montane rainforest, 25.ii.2011 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, 12.5231°S, 49.179°E, 1100 m, montane rainforest, 11.iii.2011 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, 12.5342°S, 49.1761°E, 1325 m, montane rainforest, 12.iii.2011 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, 12.5247°S, 49.1724°E, 1235 m, montane rainforest, 10.iii.2011 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, 3.6 km 235° SW Joffreville, 12.5344°S, 49.1795°E, 925 m, montane rainforest, 20.i.2001 (Fisher, Griswold et al.); Antsiranana, Parc National Montagne d’Ambre, Mahasarika, 12.5318°S, 49.1766°E, 1135 m, montane rainforest, 19.xi.2007 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, Petit lac, 12.5366°S, 49.1741°E, 1130 m, montane rainforest, 17.xi.2007 (B.L.Fisher et al.); Antsiranana, Parc National Montagne d’Ambre, Roussettes, 12.5257°S, 49.1724°E, 1025 m, montane rainforest, 15.xi.2007 (B.L.Fisher et al.); Fianarantsoa, 43 km S Ambalavao, Rés. Andringitra, 22.2333°S, 47°E, 825 m, rainforest, 5.x.1993 (B.L.Fisher); Fianarantsoa, 45 km S. Ambalavao, 22.2167°S, 47.0167°E, 785 m, rainforest, 25.ix.1993 (B.L.Fisher); Fianarantsoa, Forêt d’Ambalagoavy Nord, Ikongo, Ambatombe, 21.8275°S, 47.3389°E, 625 m, 1.xii.2000 (R. Harin’Hala & M.E. Irwin); Fianarantsoa, Forêt de Vevembe, 66.6 km 293° Farafangana, 22.791°S, 47.1818°E, 600 m, rainforest, transition to montane forest, 24.iv.2006 (B.L. Fisher et al.); Fianarantsoa, Réserve Forestière d’Agnalazaha, Mahabo, 42.9 km 215° Farafangana, 23.1938°S, 47.723°E, 20 m, littoral rainforest, 19.iv.2006 (B.L. Fisher et al.); Fianarantsoa, Réserve Spéciale Manombo 24.5 km 228° Farafangana, 23.0158°S, 47.719°E, 30 m, rainforest, 22.iv.2006 (B.L. Fisher et al.); Mahajanga, Réserve Spéciale Marotandrano, Marotandrano 48.3 km S Mandritsara, 16.2832°S, 48.8144°E, 865 m, transition humid forest, 7.xii.2007 (B.L.Fisher et al.); Toamasina, 16 km S Moramanga, 19.0833°S, 48.2333°E, 950 m, rainforest, 18.xi.1990 (P. S. Ward); Toamasina, 5.3 km SSE Ambanizana, Andranobe, 15.6713°S, 49.974°E, 425 m, rainforest, 21.xi.1993 (B.L.Fisher); Toamasina, 6.3 km S Ambanizana, Andranobe, 15.6813°S, 49.958°E, 25 m, rainforest, 14.xi.1993 (B.L.Fisher); Toamasina, 6.9 km NE Ambanizana, Ambohitsitondroina, 15.5851°S, 50.0095°E, 825 m, rainforest, 2.xii.1993 (B.L.Fisher); Toamasina, 6.9 km NE Ambanizana, Ambohitsitondroina, 15.5667°S, 50°E, 1000 m, montane rainforest, 8.xii.1993 (B.L.Fisher); Toamasina, 6 km ESE Andasibe (=Perinet), 18.95°S, 48.4667°E, 900 m, rainforest, 17.xi.1990 (P. S. Ward); Toamasina, Ambanizana, Parc National Masoala, 15.5717°S, 50.0061°E, 925 m, montane rainforest, 26.ii.2003 (D. Andriamalala, D. Silva, et al.); Toamasina, Ambanizana, Parc National Masoala, 15.5722°S, 50.0069°E, 1020 m, montane rainforest, 2.iii.2003 (D. Andriamalala, D. Silva, et al.); Toamasina, Ambatovy, 12.4 km NE Moramanga, 18.8394°S, 48.3084°E, 1080 m, montane rainforest, 8.iii.2007 (B.L.Fisher et al.); Toamasina, Ambatovy, 12.4 km NE Moramanga, 18.8496°S, 48.2947°E, 1010 m, montane rainforest, 3.iii.2007 (B.L.Fisher et al.); Toamasina, Analamay, 18.8062°S, 48.3371°E, 1068 m, montane rainforest, 21.iii.2004 (Malagasy ant team); Toamasina, Ankerana, 18.4067°S, 48.8228°E, 681 m, degraded forest, 28.i.2012 (B.L.Fisher et al.); Toamasina, Ankerana, 18.4064°S, 48.8025°E, 1108 m, montane forest, 19.i.2012 (B.L.Fisher et al.); Toamasina, Ankerana, 18.4104°S, 48.8189°E, 855 m, rainforest, 25.i.2012 (B.L.Fisher et al.); Toamasina, Ankerana, 18.4017°S, 48.806°E, 1035 m, montane forest, 24.i.2012 (B.L.Fisher et al.); Toamasina, Ankerana, 18.4006°S, 48.8131°E, 865 m, rainforest, 17.i.2012 (B.L.Fisher et al.); Toamasina, Ankerana, 18.4083°S, 48.8211°E, 750 m, rainforest, 21.i.2012 (B.L.Fisher et al.); Toamasina, Ankerana, 18.4061°S, 48.8203°E, 725 m, rainforest, 16.i.2012 (B.L.Fisher et al.); Toamasina, Bevolota 17.1 km N Andasibe, 18.7707°S, 48.4316°E, 995 m, montane rainforest, 12.xii.2007 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambatoharanana, 18.8042°S, 48.4008°E, 968 m, rainforest, 12.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambatoharanana, 18.8039°S, 48.4051°E, 1013 m, rainforest, 12.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambatoharanana, 18.804°S, 48.4036°E, 1064 m, rainforest, 12.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambatoharanana, 18.8044°S, 48.4074°E, 960 m, rainforest, 12.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambohibolakely, 18.779°S, 48.3638°E, 918 m, rainforest, 23.xi.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambohibolakely, 18.7791°S, 48.3663°E, 1014 m, rainforest, 23.xi.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambohibolakely, 18.7609°S, 48.3713°E, 1044 m, rainforest, 29.xi.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Ambohibolakely, 18.7613°S, 48.3644°E, 983 m, rainforest, 26.xi.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Tsaravoniana, 18.7612°S, 48.4213°E, 939 m, rainforest, 2.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Tsaravoniana, 18.7637°S, 48.4203°E, 984 m, rainforest, 2.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Tsaravoniana, 18.7646°S, 48.4194°E, 1039 m, rainforest, 4.xii.2012 (B.L.Fisher et al.); Toamasina, Corridor Forestier Analamay-Mantadia, Tsaravoniana, 18.7574°S, 48.423°E, 1018 m, rainforest, 8.xii.2012 (B.L.Fisher et al.); Toamasina, F.C. Andriantantely, 18.695°S, 48.8133°E, 530 m, rainforest, 4.xii.1998 (H.J.Ratsirarson); Toamasina, F.C. Didy, 18.1983°S, 48.5783°E, 960 m, rainforest, 16.xii.1998 (H.J.Ratsirarson); Toamasina, F.C. Sandranantitra, 18.0483°S, 49.0917°E, 450 m, rainforest, 18.i.1999 (H.J.Ratsirarson); Toamasina, Forêt Ambatovy, 14.3 km 57° Moramanga, 18.8508°S, 48.32°E, 1075 m, montane rainforest, 12.iv.2005 (B.L.Fisher); Toamasina, Montagne d’Akirindro 7.6 km 341° NNW Ambinanitelo, 15.2883°S, 49.5483°E, 600 m, rainforest, 17.iii.2003 (Fisher, Griswold et al.); Toamasina, Montagne d’Anjanaharibe, 18.0 km 21° NNE Ambinanitelo, 15.1883°S, 49.615°E, 470 m, rainforest, 8.iii.2003 (Fisher, Griswold et al.); Toamasina, Montagne d’Anjanaharibe, 19.5 km 27° NNE Ambinanitelo, 15.1783°S, 49.635°E, 1100 m, montane rainforest, 12.iii.2003 (Fisher, Griswold et al.); Toamasina, Nosy Mangabe, 7.43 km S Maroantsetra, 15.4973°S, 49.7622°E, 5 m, littoral rainforest edge, 25.vii.2007 (B.L.Fisher et al.); Toamasina, P.N. Mantadia, 18.7917°S, 48.4267°E, 895 m, rainforest, 25.xi.1998 (H.J.Ratsirarson); Toamasina, Parc National de Zahamena, 17.7336°S, 48.7263°E, 950 m, rainforest, 19.ii.2009 (B.L.Fisher et al.); Toamasina, Parc National de Zahamena, Besaky River, 17.7524°S, 48.8532°E, 760 m, rainforest, 22.ii.2009 (B.L.Fisher et al.); Toamasina, Parc National de Zahamena, Onibe River, 17.7591°S, 48.8547°E, 780 m, rainforest, 21.ii.2009 (B.L.Fisher et al.); Toamasina, Parc National de Zahamena, Sahavorondrano River, 17.7526°S, 48.8573°E, 765 m, rainforest, 23.ii.2009 (B.L.Fisher et al.); Toamasina, Parc National de Zahamena, Tetezambatana forest, near junction of Nosivola and Manakambahiny Rivers, 17.743°S, 48.7294°E, 860 m, rainforest, 18.ii.2009 (B.L.Fisher et al.); Toamasina, Reserve Betampona, Camp Rendrirendry 34.1 km 332° Toamasina, 17.924°S, 49.1997°E, 390 m, rainforest, 29.xi.2005 (B.L.Fisher et al.); Toamasina, Reserve Betampona, Camp Vohitsivalana, 37.1 km 338° Toamasina, 17.8867°S, 49.2025°E, 520 m, rainforest, 2.xii.2005 (B.L.Fisher et al.); Toamasina, Réserve Nationale Intégrale Betampona, Betampona 35.1 km NW Toamasina, 17.918°S, 49.2007°E, 500 m, rainforest, 15.xii.2007 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.7702°S, 49.2664°E, 470 m, rainforest, 23.ii.2010 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.7747°S, 49.2655°E, 355 m, rainforest along river, 21.ii.2010 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.7633°S, 49.2669°E, 520 m, rainforest, 22.ii.2010 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.7727°S, 49.2655°E, 450 m, rainforest, 20.ii.2010 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.7691°S, 49.267°E, 475 m, rainforest, 21.ii.2010 (B.L.Fisher et al.); Toamasina, Réserve Spéciale Ambatovaky, Sandrangato river, 16.8175°S, 49.295°E, 360 m, rainforest, 25.ii.2010 (B.L.Fisher et al.); Toamasina, S.F. Tampolo, 10 km NNE Fenoarivo Atn., 17.2825°S, 49.43°E, 10 m, littoral rainforest, 5.iv.1997 (B.L.Fisher); Toamasina, Sahafina forest 11.4 km W Brickaville, 18.8145°S, 48.962°E, 140 m, rainforest, 13.xii.2007 (B.L.Fisher et al.); Toamasina, Torotorofotsy, 18.8708°S, 48.3474°E, 1070 m, montane rainforest, marsh edge, 24.iii.2004 (Malagasy ant team); Toamasina, Torotorofotsy, 18.7705°S, 48.4304°E, 1005 m, montane rainforest, 12.iii.2012 (B.L.Fisher et al.); Toliara, Parc National Andohahela, Col de Tanatana, 33.3 km NW Tolagnaro, 24.7585°S, 46.8537°E, 275 m, rainforest, 28.xi.2006 (B.L.Fisher et al.); Toliara, Parc National d’Andohahela, Manampanihy River, 5.4 km 113° ESE Mahamavo, 36.7 km 343° NNW Tolagnaro, 24.7639°S, 46.7668°E, 650 m, rainforest, 24.i.2002 (Fisher-Griswold Arthropod Team); Toliara, Rés. Andohahela, 6 km SSW Eminiminy, 24.7333°S, 46.8°E, 330 m, rainforest, 4.ii.1993 (P.S.Ward); Toliara, Réserve Spéciale d’Ambohijanahary, Forêt d’Ankazotsihitafototra, 35.2 km 312° NW Ambaravaranala, 18.2667°S, 45.4067°E, 1050 m, montane rainforest, 13.i.2003 (Fisher, Griswold et al.).
Holotype, pinned worker, MADAGASCAR, Antsiranana, 9.2 km WSW Befingotra, Rés. Anjanaharibe-Sud, 14.75°S, 49.46667°E, 1260 m, montane rainforest, canopy moss and leaf litter, collection code BLF01217, 11.xi.1994 (B.L. Fisher et al.) (CASC: CASENT0009472). Paratypes, six pinned workers with same data as holotype (CASC: CASENT0009473; CASENT0009474; CASENT0191885; CASENT0339228; CASENT0339229; CASENT0339230).
P. talos can be recognized by the following combination of characters: twelve antennal segments; large globular eye which appears as a half-sphere emerging from the surface of the head, composed of several asymmetrical subunits visible under high magnification; pronounced, tricolored body with a dark brown head, light brown body, and yellow/pale legs; known only from the Anjanaharibe-Sud Reserve in northeastern Madagascar.
(N=9). HL 0.5–0.53 (0.52); HW 0.39–0.43 (0.41); SL 0.28–0.3 (0.28); WL 0.52–0.62 (0.56); PetL 0.14–0.16 (0.15); PetW 0.21–0.24 (0.23); T1W 0.35–0.38 (0.36); CI 77.07–81.19 (79.06); PI 143.95–163.83 (152.84); SI 67.23–72.59 (69.8).
In full-face view, cephalic foveae become denser medially, so that laterally, foveae are separated by more than the diameter of one fovea, and medially, many foveae are directly adjacent and tend to form longitudinal chains of connected foveae; areas between foveae dark brown and shining; median cephalic area devoid of foveae not swelling above the surface of the surrounding integument and characterized as being widest anteriorly, narrowing posteriorly; apical tooth relatively short in length; eyes largest of all Malagasy Prionopelta, uniformly globular in shape, and under very high magnification, appear to be composed of several subunits which form a conglomerate half-sphere; both large, shallow foveae and small punctures present on pronotum and mesonotum; propodeal surface possesses only large shallow foveae; strong metanotal groove in dorsal view; strong mesopropodeal suture; distinctly tricolored body with uniformly dark brown head, tan mesosoma and gaster, and pale yellow legs and antennae.
The rich brown color of the shiny integument of this taxon inspired the name “Talos”, after the living bronze statue that protected Europa from invaders in Greek mythology. The species epithet is an arbitrary combination of letters, and thus invariant.
This rare ant is known from a single locality in the Anjanaharibe-Sud Reserve in the province of Antsiranana (Fig.
P. talos is most likely to be confused with P. descarpentriesi as it has a similar arrangement of cephalic foveae to some individuals of P. descarpentriesi (morphotype A). However, P. talos has distinctly shaped and larger eyes and a striking color pattern that distinguishes it quite easily from all Malagasy congeners.
P. talos holotype worker (CASENT0009472). A Head in full-face view B Body in profile C Body in dorsal view.
Holotype, pinned worker, MADAGASCAR, Antsiranana, Forêt d’Analabe, 30.0 km 72° ENE Daraina, 13.08333°S, 49.90833°E, 30 m, littoral rainforest, sifted litter (leaf mold, rotten wood), collection code BLF09426, 27.xi.2003 (B.L. Fisher et al.) (CASC: CASENT0041504). Paratypes, three pinned workers with same data as holotype (CASC: CASENT0041500; CASENT0041501; CASENT0041502).
P. vampira is the only member of the genus from the Malagasy region in which workers entirely lack any visible metanotal suture when viewed dorsally; additionally the posterior propodeal edge is noticeably more concave in dorsal view than any other Malagasy Prionopelta.
(N=8). HL 0.49–0.53 (0.5); HW 0.41–0.45 (0.42); SL 0.27–0.31 (0.28); WL 0.55–0.62 (0.58); PetL 0.19–0.23 (0.21); PetW 0.24–0.26 (0.25); T1W 0.35–0.39 (0.37); CI 81.78–85.31 (83.78); PI 103.96–130.2 (120.71); SI 64.25–69.36 (67.33).
Highest cephalic index on average of Malagasy Prionopelta (CI 81.78–85.31 (83.78); posterior margin of the head with slight notch medially in full-face view; cephalic foveae shallow, large, and widely spaced; directly adjacent cephalic foveae either completely lacking, or very rare; if any foveae are adjacent, then always with only 2–3 foveae connected, and these usually always medially on the head in full-face view; majority of cephalic foveae separated by 1–3 foveal diameters, appear cleanly scooped from the shining integument, and lack raised margins; median cephalic band devoid of foveae is uniformly broad, and not swelling above the integument; apical tooth very long, longest of all Malagasy Prionopelta, over four times the length of the third apical tooth measured from base to tip (Fig.
The name of this species is inspired by the vampire-like nature of its exceptionally long apical tooth. The species epithet is a Latinized adjective of the German and Hungarian word “vampir”.
This species is almost entirely restricted to northern Madagascar where it is found in litter in rainforest, littoral rainforest, and montane rainforest from 25–1200 meters of elevation. Intriguingly, P. vampira has also been collected at a single, highly disjunct site in far southeastern Madagascar 1048 km to the south near Enakara in the province of Toliara (Fig.
This species, which has similar cephalic scupturing to P. xerosilva, is otherwise unmistakable due to its extremely long apical tooth, lack of a metanotal suture, and strongly concave posterior propodeal edge when viewed dorsally.
P. vampira holotype worker (CASENT0041504). A Head in full-face view B Body in profile C Body in dorsal view.
MADAGASCAR: Antsiranana, Ampasindava, Andranomatavy Forest, 13.669°S, 47.9877°E, 149 m, disturbed dry forest, 6.x.2013 (B.L.Fisher et al.); Antsiranana, Ampasindava, Andranomatavy Forest, 13.663°S, 47.9794°E, 543 m, disturbed dry forest, 6.x.2013 (B.L.Fisher et al.); Antsiranana, Forêt Ambato, 26.6 km 33° Ambanja, 13.4645°S, 48.5517°E, 150 m, rainforest, 8.xii.2004 (B.L.Fisher); Antsiranana, Forêt d’ Andavakoera, 21.4 km 75° ENE Ambilobe; 4.6 km 356° N Betsiaka, 13.1183°S, 49.23°E, 425 m, rainforest, 15.xii.2003 (B.L.Fisher); Antsiranana, Forêt d’Ampombofofo, 12.0995°S, 49.3387°E, 25 m, littoral forest, 21.xi.2007 (B.L.Fisher et al.); Antsiranana, Forêt d’Analabe, 30.0 km 72° ENE Daraina, 13.0833°S, 49.9083°E, 30 m, littoral rainforest, 27.xi.2003 (B.L.Fisher); Antsiranana, Makirovana forest, 14.1707°S, 49.9541°E, 225 m, rainforest, 4.v.2011 (B.L.Fisher et al.); Antsiranana, Nosy Be, Réserve Naturelle Intégrale de Lokobe, 6.3 km 112° ESE Hellville, 13.4193°S, 48.3312°E, 30 m, rainforest, 19.iii.2001 (Fisher, Griswold et al.); Toliara, 11 km NW Enakara, Rés. Andohahela, 24.5667°S, 46.8333°E, 800 m, rainforest, 17.xi.1992 (B.L.Fisher).
Holotype, pinned worker, MADAGASCAR, Mahajanga, Réserve Forestière Beanka, 50.7 km E Maintirano, 17.88021°S, 44.46877°E, 140 m, tropical dry forest on tsingy, sifted litter (leaf mold, rotten wood), BLF22999, 29.x.2009 (B.L. Fisher et al.) (CASC: CASENT0157254). Paratypes, six pinned workers with same data as holotype (CASC: CASENT0157257; CASENT0157258; CASENT0157260; CASENT0157262; CASENT0157701, CASENT0157702).
P. xerosilva is identifiable from the following combination of characters: cephalic foveae consistently and widely separated by 1–3 foveal diameters, with foveae directly adjacent only extremely rarely, including at the posterolateral corners of the head; metanotal suture strongly visible in dorsal view.
(N=6). HL 0.43–0.46 (0.45); HW 0.34–0.36 (0.35); SL 0.23–0.25 (0.24); WL 0.45–0.5 (0.48); PetL 0.14–0.15 (0.15); PetW 0.19–0.21 (0.2); T1W 0.31–0.33 (0.32); CI 74.35–81.82 (77.85); PI 126.8–148.18 (138.76); SI 65.51–71.88 (69.77).
Cephalic foveae shallow, large, and most widely spaced of the Malagasy Prionopelta; directly adjacent cephalic foveae either completely lacking, or very rare; if any foveae are adjacent, then always with only 2–3 foveae connected, and these usually located medially on the head in full-face view; majority of cephalic foveae are separated by 1–3 foveal diameters, appear cleanly scooped from shining integument, and lack any raised margins at their perimeter; median cephalic band devoid of foveae is wide along its length, not tapering posteriorly; coronal suture absent medially on the head; apical tooth intermediate in length, never more than 4 times as long as the third tooth from base to tip (Fig.
The name of this new species is a combination of the Greek adjective “xero” meaning dry and the Latin noun “silva” for forest, as this species is known only from tropical dry forests in western Madagascar.
P. xerosilva is known only from tropical dry forests in the province of Mahajanga in western-central Madagascar (Fig.
With its uniformly and widely spaced cephalic foveae, P. xerosilva could only be confused with P. vampira. However, the latter lacks a metanotal suture and possesses a very long apical tooth, a strongly concave posterior edge of the propodeum in dorsal view, and lamellae protruding from the posterior propodeum, all of which P. xerosilva lacks.
P. xerosilva holotype worker (CASENT0157254). A Head in full-face view B Body in profile C Body in dorsal view.
MADAGASCAR: Mahajanga, Parc National Tsingy de Bemaraha, 10.6 km ESE 123° Antsalova, 18.7094°S, 44.7182°E, 150 m, tropical dry forest on Tsingy, 16.xi.2001 (Fisher-Griswold Arthropod Team); Mahajanga, Parc National Tsingy de Bemaraha, 2.5 km 62° ENE Bekopaka, Ankidrodroa River, 19.1322°S, 44.8147°E, 100 m, tropical dry forest on Tsingy, 11.xi.2001 (Fisher-Griswold Arthropod Team); Mahajanga, Parc National Tsingy de Bemaraha, 3.4 km 93° E Bekopaka, Tombeau Vazimba, 19.1419°S, 44.828°E, 50 m, tropical dry forest, 6.xi.2001 (Fisher-Griswold Arthropod Team); Mahajanga, Réserve forestière Beanka, 50.2 km E Maintirano, 18.0265°S, 44.0505°E, 250 m, tropical dry forest on tsingy, 19.x.2009 (B.L.Fisher et al.); Mahajanga, Réserve forestière Beanka, 52.7 km E Maintirano, 18.0622°S, 44.5259°E, 300 m, tropical dry forest on tsingy, 24.x.2009 (B.L.Fisher et al.).
The fieldwork on which this study is based could not have been completed without the gracious support of the Malagasy Arthropod Inventory Team (Balsama Rajemison, Jean-Claude Rakotonirina, Jean-Jacques Rafanomezantsoa, Chrislain Ranaivo, Hanitriniana Rasoazanamavo, Nicole Rasoamanana, Clavier Randrianandrasana, Dimby Raharinjanahary, Njaka Ravelomanana, and Manoa Ramamonjisoa). We thank the following institutions for delivering authorizations for the capture, collection and exportation of ants—MADAGASCAR: Ministère de l’ Environnement et des Forêts and the Madagascar National Parks; SEYCHELLES: Seychelles Bureau of Standards, Ministry of Environment, and National Park Authority. In the Seychelles, we benefited from the generous help of Pat Matyot, Gérard Rocamora, and Gaëtan Galman of Island Conservation Society, Seychelles; Justin Gerlach from the Nature Protection Trust of Seychelles, Silhouette; Lindsay Chong-Seng and Nancy Bunbury of the Seychelles Islands Foundation (SIF) in Vallée de Mai and Aldabra; and many locals who offered their expertise, guidance, and companionship on each of the islands. Francisco Hita Garcia and Georg Fischer provided invaluable assistance contributing to this work. Michele Esposito provided expertise and time contributing to both the production of images for this revision, as well as the online databasing of specimens. Masashi Yoshimura and Flavia Esteves provided additional support and assistance aiding in the publication of this revision. Flavia Esteves also organized the R scripts for creating the maps and processed the shape files. This project was supported by National Geographic grant No. 8429-08 and National Science Foundation grants DEB-0072713, DEB-0344731, and DEB-0842395 to BLF.