Research Article |
Corresponding author: Sandor Csosz ( sandorcsosz2@gmail.com ) Academic editor: Marek Borowiec
© 2016 Sandor Csosz, Brian 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:
Csősz S, Fisher BL (2016) Taxonomy of Malagasy Nesomyrmex brevicornis species-group using conventional morphology-based approach. ZooKeys 616: 125-159. https://doi.org/10.3897/zookeys.616.9532
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Here we describe the diversity of the Malagasy Nesomyrmex brevicornis-group as the final installment of series describing the complete Malagasy Nesomyrmex fauna. In the current paper introduce the N. brevicornis-group, a newly outlined species group. We split this group from one of the four former groups, N. madecassus-group (sensu
Madagascar, taxonomy, morphometry, species delimitation, biogeography
The ant genus Nesomyrmex has been the subject of intensive systematic research in recent years, and contributes to efforts to explore the ant fauna of the Malagasy zoogeographical region, i.e. Madagascar and surrounding islands (
In the current paper we complete the reexamination of Malagasy Nesomyrmex with a revision of the fifth species group, N. brevicornis-group, and by describing the nine species that are new to science. This group is subsequently split from the N. madecassus-group (sensu
All species of the bervicornis-group are arboreal; most nest in twigs or hollow branches, but some have very specialized associations with live stems or particular species of trees. Nesomyrmex cingulatus sp. n., for example, is known only from live stems from spiny thicket near Tsimanampetsotsa. N. minutus sp. n. is unique in nesting only in the stems of Macphersonia gracilis (Sapindaceae) and represents one of the few known ant plants in Madagascar. The specialized nesting habits of the bervicornis-group may explain why collections of this group are minimal compared to other Nesomyrmex species.
As the material available within this species group is insufficiently large for statistical evaluation, morphological diversity is assessed via evaluation of qualitative traits or trait-combination. Species are believed to have characteristic shapes, sizes, pigmentation patterns, sculpture, and other external features that may help in species separation and subsequent identification (
Qualitative evaluation of morphological data has revealed the existence of nine morphologically distinct species within N. brevicornis species-group in the Malagasy zoogeographical region, Nesomyrmex brevicornis sp. n., N. brunneus sp. n., N. cingulatus sp. n., N. edentates sp. n., N. flavigaster sp. n., N. longiceps sp. n., N. minutus sp. n., N. punctaticeps sp. n., and N. sellaris sp. n.. We provide a traditional, character-based key supported by simple numeric data based on body size ratios. Geographic maps showing the distribution of these species where populations of particular species were collected are also provided.
In the present study, 21 continuous morphometric traits were recorded in 146 worker individuals belonging to 111 nest samples and 35 further single individuals collected in the Malagasy region.
The material is deposited in the following institutions, abbreviations after
All images of specimens used in this study are available online on AntWeb (http://www.antweb.org). Images are linked to their specimens via the unique specimen code affixed to each pin (CASENT0027494). Online specimen identifiers follow this format: http://www.antweb.org/specimen/CASENT0027494.
Digital color montage images were created using a JVC KY-F75 digital camera and Syncroscopy Auto-Montage software (version 5.0), or a Leica DFC 425 camera in combination with the Leica Application Suite software (version 3.8). Distribution maps were generated in R (
Measurements were taken with a Leica MZ 12.5 stereomicroscope equipped with an ocular micrometer at a magnification of 100×. Measurements and indices are presented as arithmetic means with minimum and maximum values in parentheses. Body size dimensions are expressed in µm. Due to the abundance of worker individuals available relative to queen and male specimens, the present revision is based on worker caste only. Worker-based revision is further facilitated by the fact that the name-bearing type specimens of the vast majority of existing ant taxa belong to the worker caste. All measurements were made by the first author. For the definition of morphometric characters, earlier protocols (Csősz et al. 2015,
CL Maximum cephalic length in median line. The head must be carefully tilted to the position providing the true maximum. Excavations of hind vertex and/or clypeus reduce CL.
CW Maximum width of the head. Includes compound eyes.
CWb Maximum width of head capsule without the compound eyes. Measured just posterior of the eyes.
CS Absolute cephalic size. The arithmetic mean of CL and CWb.
Cdep Antero-median clypeal depression. Maximum depth of the median clypeal depression on its anterior contour line as it appears in fronto-dorsal view.
EL Maximum diameter of the compound eye.
FRS Frontal carina distance. Distance of the frontal carinae immediately caudal of the posterior intersection points between frontal carinae and the torular lamellae. If these dorsal lamellae do not laterally surpass the frontal carinae, the deepest point of scape corner pits may be taken as the reference line. These pits occupy the inner corner of the scape base when the scape is directed caudally and produce a dark triangular shadow in the lateral frontal lobes immediately posterior to the dorsal lamellae of the scape joint capsule.
ML
MW Mesosoma width. In workers MW is defined as the longest width of the pronotum in dorsal view excluding the pronotal spines.
MPST Maximum distance from the center of the propodeal stigma to the anteroventral corner of the ventrolateral margin of the metapleuron.
NOH maximum height of the petiolar node. Measured in lateral view from the uppermost point of the petiolar node perpendicular to a reference line set from the petiolar spiracle to the imaginary midpoint of the transition between dorso-caudal slope and dorsal profile of caudal cylinder of the petiole.
NOL Length of the petiolar node. Measured in lateral view from the center of petiolar spiracle to dorso-caudal corner of caudal cylinder. Do not erroneously take as the reference point the dorso-caudal corner of the helcium, which is sometimes visible.
PEH maximum petiole height. The chord of the ventral petiolar profile at node level is the reference line perpendicular to which the maximum height of petiole is measured.
PEL Diagonal petiolar length in lateral view; measured from anterior corner of subpetiolar process to dorso-caudal corner of caudal cylinder.
PEW Maximum width of petiole in dorsal view. Nodal spines are not considered.
PoOC Postocular distance. Use a cross-scaled ocular micrometer and adjust the head to the measuring position of CL. Caudal measuring point: median occipital margin; frontal measuring point: median head at the level of the posterior eye margin.
PPH Maximum height of the postpetiole in lateral view. Measured perpendicularly to a line defined by the linear section of the segment border between dorsal and ventral petiolar sclerite.
PPL Postpetiole length. The longest anatomical line that is perpendicular to the posterior margin of the postpetiole and is between the posterior postpetiolar margin and the anterior postpetiolar margin.
PPW Postpetiole width. Maximum width of postpetiole in dorsal view.
SL Scape length. Maximum straight line scape length excluding the articular condyle.
SPST Spine length. Distance between the center of propodeal stigma and spine tip. The stigma center refers to the midpoint defined by the outer cuticular ring but not to the center of the real stigma opening, which may be positioned eccentrically.
SPTI Apical spine distance. The distance of spine tips in dorsal view; if spine tips are rounded or truncated, the centers of spine tips are taken as reference points.
In verbal descriptions of taxa based on external morphological traits, recent taxonomic papers (
Hypothesis formation. The present paper aims to reveal diversity of N. brevicornis species-group, including a number of very rare species represented only by three to four individuals. This high level of asymmetry in data, coupled with the extremely low average number of individuals per species, prevents employment of statistical analyses in hypothesis formation and testing. Instead, the conventional morphology-based approach (i.e., individuals are sorted into clusters using simple eye inspection based on salient morphological features, e.g., shape, sculpture etc.) is used as the primary technique for recognizing species. Morphometric data are given for each species as secondary data for confirmation and in order to improve identification.
Based on the applied conventional morphology-based approach, nine remarkably different morphologies are recognized to be considered species. These species can also be characterized by, and separated from each other using, at least one non-overlapping body-size ratio. Morphometric indices are provided for all species in Table
Mean of morphometric ratios calculated species-wise on individual level. Morphometric traits are divided by absolute cephalic size (CS), ±SD are provided in the upper row, minimum and maximum values are given in parentheses in the lower row.
brevicornis (n = 3) | brunneus (n = 36) | cingulatus (n = 26) | edentatus (n = 3) | flavigaster (n = 14) | longiceps (n = 4) | minutus (n = 29) | punctaticeps (n = 17) | sellaris (n = 15) | |
---|---|---|---|---|---|---|---|---|---|
CS | 506 ±33 | 721 ±58 | 459 ±25 | 546 ±13 | 637 ±51 | 531 ±36 | 472 ±31 | 473 ±30 | 449 ±36 |
[472, 536] | [620, 808] | [419, 515] | [535, 560] | [546, 740] | [478, 556] | [405, 549] | [424, 549] | [410, 557] | |
CL/CW | 1.32 ±0.05 | 1.12 ±0.03 | 1.34 ±0.04 | 1.19 ±0.00 | 1.21 ±0.02 | 1.42 ±0.02 | 1.29 ±0.05 | 1.17 ±0.04 | 1.16 ±0.04 |
[1.28, 1.37] | [1.07, 1.19] | [1.26, 1.39] | [1.18, 1.19] | [1.16, 1.25] | [1.40, 1.44] | [1.17, 1.36] | [1.11, 1.23] | [1.09, 1.25] | |
CL/CWb | 1.33 ±0.02 | 1.14 ±0.02 | 1.37 ±0.04 | 1.20 ±0.01 | 1.24 ±0.02 | 1.43 ±0.02 | 1.29 ±0.05 | 1.20 ±0.04 | 1.18 ±0.03 |
[1.32, 1.35] | [1.09, 1.21] | [1.30, 1.45] | [1.19, 1.21] | [1.21, 1.29] | [1.42, 1.46] | [1.20, 1.36] | [1.14, 1.26] | [1.13, 1.25] | |
POoC/CL | 0.52 ±0.01 | 0.44 ±0.03 | 0.51 ±0.01 | 0.48 ±0.01 | 0.43 ±0.01 | 0.44 ±0.01 | 0.52 ±0.01 | 0.49 ±0.01 | 0.51 ±0.01 |
[0.51, 0.52] | [0.39, 0.47] | [0.49, 0.52] | [0.47, 0.49] | [0.41, 0.45] | [0.42, 0.45] | [0.51, 0.54] | [0.47, 0.51] | [0.49, 0.53] | |
FRS/CS | 0.36 ±0.02 | 0.33 ±0.01 | 0.31 ±0.01 | 0.30 ±0.01 | 0.34 ±0.01 | 0.26 ±0.01 | 0.35 ±0.02 | 0.33 ±0.01 | 0.29 ±0.01 |
[0.34, 0.37] | [0.31, 0.35] | [0.30, 0.33] | [0.29, 0.31] | [0.33, 0.36] | [0.25, 0.28] | [0.30, 0.39] | [0.32, 0.35] | [0.27, 0.30] | |
SL/CS | 0.54 ±0.01 | 0.64 ±0.02 | 0.63 ±0.01 | 0.66 ±0.01 | 0.62 ±0.02 | 0.63 ±0.02 | 0.57 ±0.02 | 0.66 ±0.02 | 0.69 ±0.02 |
[0.53, 0.55] | [0.60, 0.67] | [0.60, 0.65] | [0.65, 0.67] | [0.59, 0.66] | [0.61, 0.65] | [0.49, 0.61] | [0.62, 0.70] | [0.65, 0.72] | |
EL/CS | 0.25 ±0.01 | 0.22 ±0.01 | 0.24 ±0.01 | 0.25 ±0.01 | 0.23 ±0.01 | 0.22 ±0.01 | 0.25 ±0.01 | 0.24 ±0.01 | 0.24 ±0.01 |
[0.24, 0.26] | [0.20, 0.24] | [0.22, 0.26] | [0.23, 0.26] | [0.21, 0.25] | [0.21, 0.23] | [0.22, 0.28] | [0.22, 0.26] | [0.23, 0.26] | |
MW/CS | 0.59 ±0.02 | 0.60 ±0.01 | 0.55 ±0.01 | 0.56 ±0.02 | 0.59 ±0.01 | 0.53 ±0.03 | 0.56 ±0.01 | 0.61 ±0.02 | 0.58 ±0.01 |
[0.57, 0.60] | [0.56, 0.62] | [0.52, 0.57] | [0.54, 0.58] | [0.58, 0.61] | [0.50, 0.55] | [0.54, 0.58] | [0.58, 0.64] | [0.56, 0.59] | |
PEW/CS | 0.23 ±0.02 | 0.20 ±0.01 | 0.22 ±0.01 | 0.20 ±0.01 | 0.22 ±0.01 | 0.19 ±0.00 | 0.22 ±0.01 | 0.22 ±0.01 | 0.21 ±0.01 |
[0.21, 0.25] | [0.19, 0.22] | [0.21, 0.24] | [0.20, 0.22] | [0.20, 0.22] | [0.19, 0.19] | [0.20, 0.23] | [0.21, 0.24] | [0.20, 0.23] | |
PPW/CS | 0.31 ±0.01 | 0.26 ±0.01 | 0.32 ±0.01 | 0.28 ±0.01 | 0.31 ±0.01 | 0.27 ±0.01 | 0.33 ±0.01 | 0.34 ±0.02 | 0.29 ±0.01 |
[0.30, 0.33] | [0.24, 0.30] | [0.28, 0.35] | [0.27, 0.28] | [0.29, 0.33] | [0.26, 0.28] | [0.29, 0.35] | [0.30, 0.36] | [0.26, 0.31] | |
ML/CS | 1.30 ±0.01 | 1.18 ±0.03 | 1.30 ±0.02 | 1.27 ±0.04 | 1.21 ±0.02 | 1.14 ±0.03 | 1.29 ±0.03 | 1.26 ±0.02 | 1.23 ±0.02 |
[1.29, 1.31] | [1.08, 1.23] | [1.26, 1.36] | [1.23, 1.31] | [1.17, 1.23] | [1.12, 1.19] | [1.23, 1.36] | [1.22, 1.32] | [1.19, 1.26] | |
PEL/CS | 0.42 ±0.01 | 0.38 ±0.02 | 0.46 ±0.02 | 0.41 ±0.01 | 0.42 ±0.01 | 0.39 ±0.01 | 0.45 ±0.02 | 0.43 ±0.01 | 0.41 ±0.02 |
[0.41, 0.43] | [0.34, 0.42] | [0.41, 0.49] | [0.39, 0.42] | [0.40, 0.43] | [0.38, 0.40] | [0.42, 0.47] | [0.41, 0.47] | [0.38, 0.44] | |
NOL/CS | 0.26 ±0.01 | 0.23 ±0.01 | 0.32 ±0.01 | 0.26 ±0.01 | 0.23 ±0.01 | 0.24 ±0.02 | 0.26 ±0.02 | 0.28 ±0.01 | 0.25 ±0.02 |
[0.25, 0.27] | [0.20, 0.25] | [0.28, 0.34] | [0.25, 0.26] | [0.22, 0.25] | [0.22, 0.26] | [0.22, 0.29] | [0.26, 0.31] | [0.22, 0.27] | |
MPST/CS | 0.42 ±0.01 | 0.39 ±0.01 | 0.41 ±0.01 | 0.40 ±0.02 | 0.41 ±0.01 | 0.37 ±0.01 | 0.41 ±0.01 | 0.40 ±0.01 | 0.40 ±0.01 |
[0.41, 0.43] | [0.37, 0.41] | [0.37, 0.43] | [0.38, 0.41] | [0.40, 0.41] | [0.36, 0.38] | [0.38, 0.45] | [0.39, 0.42] | [0.38, 0.43] | |
PEH/CS | 0.28 ±0.02 | 0.27 ±0.01 | 0.27 ±0.01 | 0.27 ±0.01 | 0.31 ±0.01 | 0.24 ±0.01 | 0.31 ±0.02 | 0.28 ±0.01 | 0.27 ±0.01 |
[0.26, 0.30] | [0.24, 0.30] | [0.26, 0.30] | [0.25, 0.28] | [0.29, 0.33] | [0.22, 0.25] | [0.26, 0.34] | [0.27, 0.31] | [0.25, 0.29] | |
NOH/CS | 0.10 ±0.01 | 0.12 ±0.02 | 0.10 ±0.01 | 0.10 ±0.01 | 0.13 ±0.00 | 0.09 ±0.01 | 0.13 ±0.01 | 0.11 ±0.01 | 0.09 ±0.01 |
[0.08, 0.10] | [0.10, 0.15] | [0.09, 0.12] | [0.09, 0.11] | [0.12, 0.14] | [0.08, 0.09] | [0.11, 0.15] | [0.09, 0.13] | [0.07, 0.11] | |
PPH/CS | 0.25 ±0.01 | 0.23 ±0.02 | 0.27 ±0.01 | 0.22 ±0.01 | 0.28 ±0.01 | 0.21 ±0.01 | 0.26 ±0.01 | 0.28 ±0.01 | 0.22 ±0.01 |
[0.24, 0.26] | [0.18, 0.27] | [0.25, 0.30] | [0.22, 0.23] | [0.26, 0.30] | [0.21, 0.22] | [0.23, 0.29] | [0.26, 0.29] | [0.19, 0.24] | |
PPL/CS | 0.20 ±0.02 | 0.18 ±0.02 | 0.29 ±0.01 | 0.19 ±0.01 | 0.21 ±0.01 | 0.21 ±0.00 | 0.24 ±0.01 | 0.28 ±0.02 | 0.21 ±0.01 |
[0.18, 0.22] | [0.15, 0.21] | [0.26, 0.31] | [0.18, 0.21] | [0.18, 0.23] | [0.21, 0.21] | [0.22, 0.26] | [0.26, 0.31] | [0.19, 0.23] |
1 | Anterodorsal spines on petiolar node present | hafahafa -group |
– | Anterodorsal spines on petiolar node absent | 2 |
2 | Petiolar node globular in dorsal view, sides straongly convex. Postocular distance vs. petiole width (PoOc/PEW): ≤1.2 [0.72, 1.17]. Sculpture of head, mesosoma, petiole and postpetiole areolate, appears dull. Main sculpture homogenous reticulate, or rugoso-reticulate | angulatus -group |
– | Petiolar node long and narrow in dorsal view, sides nearly parallel. Postocular distance vs. petiole width (PoOc/PEW): ≥1.2 [1.2, 2.01]. Ground sculpture on head, dorsum of mesosoma, petiole and postpetiole often, but not exclusively inconspicuous, shiny. Main sculpture variable, coarse to absent | 3 |
3 | Petiolar node in lateral view higher, (MPST/NOH): 2.41 [1.89, 2.87], propodeal spines moderately long, always present, mesopropodeal depression conspicuous, deep | sikorai -group |
– | Petiolar node in lateral view lower, (MPST/NOH): 3.54 [2.71, 5.63], propodeal spines very short to absent, mesopropodeal depression variable | 4 |
4 | Mesopropodeal depression absent (except for N. gibber where a mesothoracic hump is conspicuous). Scape longer (SL/CS): 0.72–0.83. Petiole longer (PEL/CS): 0.44–0.58) | madecassus -group |
– | Mesopropodeal depression present and conspicuous (often shallow in N. flavigaster). Scape shorter (SL/CS): 0.49–0.72. Petiole shorter and higher (PEL/CS): 0.34–0.49 | brevicornis -group |
brevicornis Csősz & Fisher, sp. n.
brunneus Csősz & Fisher, sp. n.
cingulatus Csősz & Fisher, sp. n.
edentatus Csősz & Fisher, sp. n.
flavigaster Csősz & Fisher, sp. n.
longiceps Csősz & Fisher, sp. n.
minutus Csősz & Fisher, sp. n.
punctaticeps Csősz & Fisher, sp. n.
sellaris Csősz & Fisher, sp. n.
1 | Head and mesosoma dark brown to black | 2 (brevicornis, brunneus, edentatus, flavigaster) |
– | Head and mesosoma yellow | 5 (cingulatus, longiceps, minutus, punctaticeps, sellaris) |
2 | Gaster pale yellow, the rest of the body dark brown to black (Fig. |
flavigaster |
– | Body—including gaster—concolorous, dark brown to black (Fig. |
3 (brevicornis, brunneus, edentatus) |
3 | Large species, cephalic size (CS) > 620 µm [620, 808] | brunneus |
– | Smaller species, cephalic size (CS) < 560 µm [472, 560] | 4 (brevicornis, edentatus) |
4 | Head feebly imbricate, appears shiny (Fig. |
edentatus |
– | Head coarsely imbricate, appears dull (Fig. |
brevicornis |
5 | First gaster tergite brown, conspicuously darker than the rest of the body (Fig. |
6 (cingulatus, minutus) |
– | Body concolorous, gaster light yellow | 7 (longiceps, punctaticeps, sellaris) |
6 | On the median area of frons foveae around setal pits larger (Fig. |
cingulatus |
– | On the median area of frons foveae around setal pits inconspicuous (Fig. |
minutus |
7 | Head longer (CL/CWb) >1.40 [1.42, 1.46], postocular area relatively shorter (PoOC/CL) < 0.45 [0.42, 0.45] | longiceps |
– | Head shorter (CL/CWb) < 0.30 [1.14, 1.26], postocular area relatively longer (PoOC/CL) > 0.47 [0.47, 0.53] | 8 (punctaticeps, sellaris) |
8 | Frontal carina distance larger (FRS/CS) > 0.33 [0.32, 0.35]. On the median area of frons foveae around setal pits larger (Fig. |
punctaticeps |
– | Frontal carina distance smaller (FRS/CS) < 0.29 [0.27, 0.30]. On the median area of frons setal pits are not embedded by foveae (Fig. |
sellaris |
Diagnostic traits for black Nesomyrmex brevicornis-group workers. Lateral view of mesosoma, petiole, postpetiole, and gaster of N. flavigaster sp. n. (1), lateral view of mesosoma, petiole, postpetiole, and gaster of N. brunneus sp. n. (2), frontal view of head of N. edentatus sp. n. (3), frontal view of head of N. brevicornis sp. n. (4). For details see main text.
Diagnostic traits for yellow Nesomyrmex brevicornis-group workers. Lateral view of mesosoma, petiole, postpetiole and gaster of N. cingulatus sp. n. (5), frontal view of head of N. cingulatus sp. n. (6), frontal view of head of N. minutus sp. n. (7), frontal view of head of N. punctaticeps sp. n. (8), frontal view of head of N. sellaris sp. n. (9). For details see main text.
Holotype: CASENT0027494, collection code: BLF07507, Parc National de Zombitse, 19.8 km 84° E Sakaraha, N -22.84333°, 44.71°, alt 770 m, Fisher, Griswold et al., 02.05.2003, (1w, CASC, CASENT0027494);
Paratypes: CASENT0195104, collection code: DMO-CS7, 48 km ENE Morondava, Kirindy, -20.06667°, 44.65°, alt 30 m, D.M.Olson, 01.05.1991, (1w, PSWC); CASENT0482280, collection code: BLF04508, Forêt de Tsimembo, 11.0 km 346° NNW Soatana, N -18.99528°, 44.4435°, alt 50 m, Fisher-Griswold Arthropod Team, 11.21.2001, (1w, CASC);
The name (brevicornis) refers to the short antennal scape that distinguishes this species from other taxa treated in this revisionary work.
Description of workers. Body color: dark brown; black. Body color pattern: concolorous. Absolute cephalic size: 506 [472, 536]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.33 [1.32, 1.35]. Postocular distance vs. cephalic length (PoOc/CL): 0.52 [0.51, 0.52]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture areolate. Setal pits on head dorsum: inconspicuous with obscure demarcation. Gena contour line in frontal view shape: convex. Genae contour from anterior view orientation: converging. Gena sculpture: ground sculpture areolate, main sculpture absent. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.25 [0.24, 0.26]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.36 [0.34, 0.37]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.54 [0.53, 0.55]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: ground sculpture areolate, main sculpture absent. Lateral region of pronotum sculpture: ground sculpture areolate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.23 [0.21, 0.25]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.31 [0.30, 0.33]. Dorsal region of postpetiole sculpture: ground sculpture areolate, main sculpture absent. Surface of first gastral tergite: continuously imbricate.
Nesomyrmex brevicornis sp. n. holotype worker (CASENT0027494). Head in full-face view (10), dorsal view of the body (11), lateral view of the body (12).
This species is known to occur in the southwestern part of Madagascar from 30–770 m (Fig.
Holotype: CASENT0919844, collection code: ANTC1302, P.N. Masoala, 40 km 154° SSE Maroantsetra, -15.72667°, 49.95667°, alt 150 m, A. Dejean et al., 10.14.2001 (1w, CASC, CASENT0919844);
Paratypes: eight workers and two gynes from the same locality under CASENT codes: CASENT0004957, collection code: ANTC1302, (2w, CASC); CASENT0004958, collection code: ANTC1302, (1Q, CASC); CASENT0004959, collection code: ANTC1302, (1Q, CASC); CASENT0008660, collection code: ANTC1302, (2w, CASC, CASENT0008660); CASENT0008661, collection code: ANTC1302, (2w, CASC); CASENT0008662, collection code: ANTC1302, (2w, CASC);
MADAGASCAR: CASENT0066844, collection code: BLF13087, Ile Sainte Marie, Forêt Kalalao, 9.9 km 34° Ambodifotatra, -16.9225°, 49.88733°, alt 100 m, B.L.Fisher et al., 11.26.2005, (1w, CASC); CASENT0082404, collection code: MA-01-01D-07, Parc National Montagne d’Ambre [Petit Lac road], -12.52028°, 49.17917°, alt 1125 m, R. Harin’Hala, 04.05.2001, (1w, CASC, CASENT0082404); CASENT0083199, collection code: MA-01-01D-09, Parc National Montagne d’Ambre [Petit Lac road], -12.52028°, 49.17917°, alt 1125 m, R. Harin’Hala, 04.26.2001, (1w, CASC); CASENT0107525, collection code: BLF11668, Nosy Be Airport, 10.3 km 30° Hell Ville, -13.32017°, 48.31083°, alt 25 m, B.L.Fisher, 12.11.2004, (1w, CASC, CASENT0107525); CASENT0138300, collection code: BLF20144, Manerinerina, 76.6 km N Antsohihy, -14.10744°, 48.11046°, alt 247 m, B.L.Fisher et al., 04.11.2008, (1w, CASC, CASENT0138300); CASENT0195102, collection code: PSW11939, 9km NNW Ranohira, P.N. Isalo, -22.48333°, 45.38333°, alt 800 m, P.S.Ward, 2.16.1993, (2w, PSWC); CASENT0195103, collection code: PSW11943, 9km NNW Ranohira, P.N. Isalo, -22.48333°, 45.38333°, alt 800 m, P.S.Ward, 02.16.1993, (2w, PSWC); CASENT0418178, collection code: BLF04708, Parc National de Masoala, 39.4 km 150° SSE Maroantsetra, -15.71°, 49.97°, alt 200 m, B.L.Fisher, H.J.Ratsirarson, 11.28.2001, (2w, CASC); CASENT0418217, collection code: BLF04724, Parc National de Masoala, 39.4 km 150° SSE Maroantsetra, -15.71°, 49.97°, alt 200 m, B.L.Fisher, H.J.Ratsirarson, 11.28.2001, (1w, CASC); CASENT0418218, collection code: BLF04723, Parc National de Masoala, 39.4 km 150° SSE Maroantsetra, -15.71°, 49.97°, alt 200 m, B.L.Fisher, H.J.Ratsirarson, 11.28.2001, (1w, CASC); CASENT0418234, collection code: BLF04696, Tampolo, Masoala Peninsula, 40.4 km 154° SSE Maroantsetra, -15.73°, 49.96°, alt 30 m, B.L.Fisher, H.J.Ratsirarson, 11.28.2001, (2w, CASC); CASENT0418244, collection code: BLF04711, Parc National de Masoala, 39.4 km 150° SSE Maroantsetra, -15.71°, 49.97°, alt 200 m, B.L.Fisher, H.J.Ratsirarson, 11.28.2001, (2w, CASC); CASENT0418285, collection code: BLF04710, Parc National de Masoala, 39.4 km 150° SSE Maroantsetra, -15.71°, 49.97°, alt 200 m, B.L.Fisher, H.J.Ratsirarson, 11.28.2001, (2w, CASC); CASENT0428256, collection code: BLF02660, Réserve Spéciale d’Ambre, 3.5 km 235° SW Sakaramy, -12.46889°, 49.24217°, alt 325 m, Fisher, Griswold et al., 01.26.2001, (1w, CASC); CASENT0488569, collection code: BLF06584, Parc National de Namoroka, 16.9 km 317° NW Vilanandro, -16.40667°, 45.31°, alt 100 m, Fisher, Griswold et al., 11.12.2002, (1w, CASC, CASENT0488569); MCZENT0576251 9km NNW Ranohira, P.N. Isalo, -22.48333°, 45.38333°, alt 800 m, P.S.Ward, 02.16.1993, (2w, MCZC); MCZENT0576252, collection code: 11939, 9km NNW Ranohira, P.N. Isalo, -22.48333°, 45.38333°, alt 800 m, P.S.Ward, 02.16.1993, (2w, MCZC); MCZENT0576253, collection code: 11939, 9km NNW Ranohira, P.N. Isalo, -22.48333°, 45.38333°, alt 800 m, P.S.Ward, 02.16.1993, (2w, MCZC).
This name (brunneus) refers to the concolorous dark brown appearance of the workers of this species.
Description of workers. Body color: dark brown; black. Body color pattern: concolorous. Absolute cephalic size: 721 [620, 808]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.14 [1.09, 1.21]. Postocular distance vs. cephalic length (PoOc/CL): 0.44 [0.39, 0.47]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture absent, smooth and shiny. Setal pits on head dorsum: inconspicuous with obscure demarcation. Gena contour line in frontal view shape: convex. Genae contour from anterior view orientation: converging; strongly converging. Gena sculpture: ground sculpture areolate, main sculpture absent. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.22 [0.20, 0.24]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.33 [0.31, 0.35]. Longitudinal carinae on median region of frons count: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.64 [0.60, 0.67]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: ground sculpture areolate, main sculpture absent. Lateral region of pronotum sculpture: ground sculpture areolate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.20 [0.19, 0.22]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.26 [0.24, 0.29]. Dorsal region of postpetiole sculpture: ground sculpture areolate, main sculpture absent. Surface of first gastral tergite: continuously imbricate.
Nesomyrmex brunneus sp. n. holotype worker (CASENT0919844). Head in full-face view (14), dorsal view of the body (15), lateral view of the body (16).
This species occurs predominantly in rainforests of northern Madagascar from 25–800 m. The only southern population is reported from a rain forest of Isalo National Park (Fig.
Holotype: CASENT0919845, collection code: BLF06205, Parc National de Tsimanampetsotsa, Mitoho Cave, 6.4 km 77° ENE Efoetse, 17.4 km 170° S Beheloka, -24.04722°, 43.75317°, alt 40 m, Fisher-Griswold Arthropod Team, 03.18.2002, (1w, CASC, CASENT0919845);
Paratypes: 22 workers and a gyne from the same locality under CASENT codes: CASENT0455751, collection code: BLF06204, (2w, CASC); CASENT0455757, collection code: BLF06205, (2w, CASC); CASENT0455756, collection code: BLF06205, (3w, CASC); CASENT0455755, collection code: BLF06205, (3w, CASC); CASENT0455759, collection code: BLF06205, (1Q, CASC); CASENT0455750, collection code: BLF06204, (3w, CASC); CASENT0455752, collection code: BLF06204, (3w, CASC); CASENT0455753, collection code: BLF06204, (3w, CASC); CASENT0455754, collection code: BLF06204, (3w, CASC);
MADAGASCAR: CASENT0003993, collection code: BLF05832, Mahafaly Plateau, 6.2 km 74° ENE Itampolo, -24.65361°, 43.99667°, alt 80 m, Fisher-Griswold Arthropod Team, 02.21.2002, (2w, CASC); CASENT0061872, collection code: MA-02-20-12, Tsimelahy - Parcel II, Andohahela National Park, transitional forest, Tulear Province, -24.93683°, 46.62667°, alt 180 m, M.E. Irwin, F.D. Parker, R. Harin’Hala, 01.06.2003, (1w, CASC); CASENT0393137, collection code: BLF36793, Anosy Region, Parc National Andohahela, Col de Tanatana, -24.74969°, 46.84949°, alt 400 m, B.L.Fisher, F.A.Esteves et al., 03.09.2015, (1w, CASC); CASENT0418656, collection code: BLF05760, Mahafaly Plateau, 6.2 km 74° ENE Itampolo, -24.65361°, 43.99667°, alt 80 m, Fisher-Griswold Arthropod Team, 02.21.2002, (2w, CASC); CASENT0418658, collection code: BLF05760, Mahafaly Plateau, 6.2 km 74° ENE Itampolo, -24.65361°, 43.99667°, alt 80 m, Fisher-Griswold Arthropod Team, 02.21.2002, (2w, CASC); CASENT0427196, collection code: BLF06256, Parc National de Tsimanampetsotsa, Forêt de Bemanateza, 20.7 km 81° E Efoetse, 23.0 km 131° SE Beheloka, -23.99222°, 43.88067°, alt 90 m, Fisher-Griswold Arthropod Team, 03.22.2002, (1w, CASC); CASENT0427197, collection code: BLF06256, Parc National de Tsimanampetsotsa, Forêt de Bemanateza, 20.7 km 81° E Efoetse, 23.0 km 131° SE Beheloka, -23.99222°, 43.88067°, alt 90 m, Fisher-Griswold Arthropod Team, 03.22.2002, (1w, CASC); CASENT0440935, collection code: BLF06159, Parc National de Tsimanampetsotsa, Mitoho Cave, 6.4 km 77° ENE Efoetse, 17.4 km 170° S Beheloka, -24.04722°, 43.75317°, alt 40 m, Fisher-Griswold Arthropod Team, 03.18.2002, (2w, CASC); CASENT0445101, collection code: BLF06320, Parc National de Tsimanampetsotsa, Forêt de Bemanateza, 20.7 km 81° E Efoetse, 23.0 km 131° SE Beheloka, -23.99222°, 43.88067°, alt 90 m, Fisher-Griswold Arthropod Team, 03.22.2002, (1w, CASC); CASENT0445102, collection code: BLF06320, Parc National de Tsimanampetsotsa, Forêt de Bemanateza, 20.7 km 81° E Efoetse, 23.0 km 131° SE Beheloka, -23.99222°, 43.88067°, alt 90 m, Fisher-Griswold Arthropod Team, 03.22.2002, (1w, CASC); CASENT0445936, collection code: BLF05502, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (2w, CASC); CASENT0449258, collection code: BLF05824, Mahafaly Plateau, 6.2 km 74° ENE Itampolo, -24.65361°, 43.99667°, alt 80 m, Fisher-Griswold Arthropod Team, 02.21.2002, (1w, CASC); CASENT0449268, collection code: BLF05833, Mahafaly Plateau, 6.2 km 74° ENE Itampolo, -24.65361°, 43.99667°, alt 80 m, Fisher-Griswold Arthropod Team, 02.21.2002, (1w, CASC); CASENT0455014, collection code: BLF06240, Parc National de Tsimanampetsotsa, Mitoho Cave, 6.4 km 77° ENE Efoetse, 17.4 km 170° S Beheloka, -24.04722°, 43.75317°, alt 40 m, Fisher-Griswold Arthropod Team, 37333, (2w, CASC); CASENT0455831, collection code: BLF06192, Parc National de Tsimanampetsotsa, Mitoho Cave, 6.4 km 77° ENE Efoetse, 17.4 km 170° S Beheloka, -24.04722°, 43.75317°, alt 40 m, Fisher-Griswold Arthropod Team, 03.18.2002, (2w, CASC);
The name (cingulatus) refers to the conspicuous dark brown transversal patch on the first gastral tergite of workers of this species.
Description of workers. Body color: yellow; brown. Body color pattern: concolorous, first gaster tergite darker. Absolute cephalic size: 459 [419, 515]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.37 [1.30, 1.45]. Postocular distance vs. cephalic length (PoOc/CL): 0.51 [0.49, 0.52]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture areolate. Setal pits on head dorsum: surrounded by conspicuous foveae with well-demarcated margins. Diameter of foveae on head dorsum: 15-20 µm. Gena contour line in frontal view shape: straight. Genae contour from anterior view orientation: converging. Gena sculpture: rugoso-reticulate with areolate ground sculpture; ground sculpture areolate, main sculpture absent. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.24 [0.22, 0.26]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.31 [0.30, 0.33]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: absent. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.63 [0.60, 0.65]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: ground sculpture areolate, main sculpture absent. Lateral region of pronotum sculpture: ground sculpture areolate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.22 [0.21, 0.24]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.32 [0.28, 0.35]. Dorsal region of postpetiole sculpture: ground sculpture areolate, main sculpture absent. Surface of first gastral tergite: continuously imbricate.
Nesomyrmex cingulatus sp. n. holotype worker (CASENT0919845). Head in full-face view (18), dorsal view of the body (19), lateral view of the body (20).
Holotype: CASENT0067086, collection code: BLF12553, Forêt d’Analava Mandrisy, 5.9 km 195ºAntanambe, -16.48567°, 49.847°, alt 10 m, B.L.Fisher et al., 11.13.2005, (1w, CASC, CASENT0067086);
Paratypes: CASENT0004811, collection code: ANTC1302, P.N. Masoala, 40 km 154° SSE Maroantsetra, -15.72667°, 49.95667°, alt 150 m, A. Dejean et al., 10.14.2001, (1w, CASC); CASENT0121563, collection code: BLF15678, Forêt Mandena 8.5 km N Tolagnaro, -24.95267°, 47.0025°, alt 20 m, B.L.Fisher et al., 12.05.2006, (1w, CASC);
The name (edentatus) refers to the absence of propodeal teeth in this species.
Description of workers. Body color: black. Body color pattern: concolorous. Absolute cephalic size: 546 [535, 560]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.20 [1.19, 1.21]. Postocular distance vs. cephalic length (PoOc/CL): 0.48 [0.47, 0.49]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture imbricate, shiny. Setal pits on head dorsum: inconspicuous with obscure demarcation. Gena contour line in frontal view shape: straight. Genae contour from anterior view orientation: converging. Gena sculpture: rugoso-reticulate with areolate ground sculpture. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.25 [0.23, 0.26]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.30 [0.29, 0.31]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons count: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.66 [0.65, 0.67]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: imbricate, main sculpture absent. Lateral region of pronotum sculpture: imbricate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.20 [0.20, 0.22]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.28 [0.27, 0.28]. Dorsal region of postpetiole sculpture: ground sculpture areolate, main sculpture absent. Surface of first gastral tergite: imbricate sculpture absent.
Nesomyrmex edentatus sp. n. holotype worker (CASENT0067086). Head in full-face view (22), dorsal view of the body (23), lateral view of the body (24).
Holotype: CASENT0453374, collection code: BLF05530, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC, CASENT0453374);
Paratypes: 25 workers from the same locality under CASENT codes: CASENT0453367, collection code: BLF05530, (1w, CASC); CASENT0453368, collection code: BLF05530, (1w, CASC); CASENT0453369, collection code: BLF05530, (1w, CASC); CASENT0453370, collection code: BLF05530, (1w, CASC); CASENT0453371, collection code: BLF05530, (1w, CASC); CASENT0453372, collection code: BLF05530, (1w, CASC); CASENT0453373, collection code: BLF05530, (1w, CASC); CASENT0453376, collection code: BLF05530, (1w, CASC); CASENT0453377, collection code: BLF05530, (1w, CASC); CASENT0453378, collection code: BLF05530, (1w, CASC); CASENT0453379, collection code: BLF05530, (1w, CASC); CASENT0453380, collection code: BLF05530, (1w, CASC); CASENT0453381, collection code: BLF05530, (1w, CASC); CASENT0453382, collection code: BLF05530, (1w, CASC); CASENT0453383, collection code: BLF05530, (1w, CASC); CASENT0453384, collection code: BLF05530, (1w, CASC); CASENT0453385, collection code: BLF05530, (1w, CASC); CASENT0453386, collection code: BLF05530, (1w, CASC); CASENT0453387, collection code: BLF05530, (1w, CASC); CASENT0453388, collection code: BLF05530, (1w, CASC); CASENT0453389, collection code: BLF05530, (2w, CASC); CASENT0453390, collection code: BLF05530, (3w, CASC, CASENT0453390).
MADAGASCAR: CASENT0136889, collection code: BLF20382, Nosy Be airport, -13.3138°, 48.31509°, alt 25 m, B.L.Fisher et al., 04.015.2008, (1w, CASC); CASENT0453655, collection code: BLF05644, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC); CASENT0453659, collection code: BLF05644, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC); CASENT0453661, collection code: BLF05526, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC); CASENT0453665, collection code: BLF05526, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC); CASENT0453685, collection code: BLF05586, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC); CASENT0453687, collection code: BLF05586, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC); CASENT0477291, collection code: BLF05504, Réserve Spéciale de Cap Sainte Marie, 12.3 km 262° W Marovato, -25.58167°, 45.16833°, alt 200 m, Fisher-Griswold Arthropod Team, 02.11.2002, (1w, CASC).
The name (flavigaster) refers to the light yellow gaster of this species, which is in sharp contrast to the dark brown color of the rest of the body.
Description of workers. Body color: dark brown; black. Body color pattern: body concolorous, gaster pale yellow. Absolute cephalic size: 629 [546, 740]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.23 [1.13, 1.29]. Postocular distance vs. cephalic length (PoOc/CL): 0.43 [0.41, 0.46]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture absent, smooth and shiny. Setal pits on head dorsum: inconspicuous with obscure demarcation. Gena contour line in frontal view shape: convex. Genae contour from anterior view orientation: converging. Gena sculpture: ground sculpture areolate, main sculpture absent; ground sculpture areolate, main sculpture costulate. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.23 [0.21, 0.25]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.34 [0.33, 0.36]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.62 [0.59, 0.66]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: imbricate, main sculpture absent. Lateral region of pronotum sculpture: imbricate, main sculpture absent; inconspicious areolate ground sculpture, main sculpture dispersed costate. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.22 [0.20, 0.22]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture dispersed rugose. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.31 [0.29, 0.33]. Dorsal region of postpetiole sculpture: ground sculpture smooth, main sculpture absent. Surface of first gastral tergite: imbricate sculpture absent.
Nesomyrmex flavigaster sp. n. holotype worker (CASENT0453374). Head in full-face view (26), dorsal view of the body (27), lateral view of the body (28).
This species is known from Madagascar’s most remote spots (Fig.
Holotype: CASENT0488528, collection code: BLF06584, Parc National de Namoroka, 16.9 km 317° NW Vilanandro, -16.40667°, 45.31°, alt 100 m, Fisher, Griswold et al., 11.12.2002, (1w, CASC, CASENT0488528);
Paratype: CASENT0488529, collection code: BLF06584, Parc National de Namoroka, 16.9 km 317° NW Vilanandro, -16.40667°, 45.31°, alt 100 m, Fisher, Griswold et al., 11.12.2002, (1w, CASC);
MADAGASCAR: CASENT0400876, collection code: BLF02660, Réserve Spéciale d’Ambre, 3.5 km 235° SW Sakaramy, -12.46889°, 49.24217°, alt 325 m, Fisher, Griswold et al., 01.26.2001, (1w, CASC); CASENT0422685, collection code: BLF02660, Réserve Spéciale d’Ambre, 3.5 km 235° SW Sakaramy, -12.46889°, 49.24217°, alt 325 m, Fisher, Griswold et al., 01.26.2001, (1w, CASC);
This name (longiceps) refers to the relatively elongated head of workers of this species.
Description of workers. Body color: yellow. Body color pattern: concolorous. Absolute cephalic size: 531 [478, 556]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.43 [1.42, 1.46]. Postocular distance vs. cephalic length (PoOc/CL): 0.44 [0.42, 0.45]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture absent, smooth and shiny. Setal pits on head dorsum: inconspicuous with obscure demarcation. Gena contour line in frontal view shape: straight. Genae contour from anterior view orientation: converging. Gena sculpture: ground sculpture areolate, main sculpture costulate. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.22 [0.21, 0.23]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.26 [0.25, 0.28]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.63 [0.61, 0.65]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: imbricate, main sculpture absent. Lateral region of pronotum sculpture: ground sculpture areolate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.19 [0.19, 0.19]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture dispersed rugose. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.27 [0.26, 0.28]. Dorsal region of postpetiole sculpture: ground sculpture smooth, main sculpture absent. Surface of first gastral tergite: imbricate sculpture absent.
Nesomyrmex longiceps sp. n. holotype worker (CASENT0488528). Head in full-face view (30), dorsal view of the body (31), lateral view of the body (32).
Holotype: CASENT0071633, collection code: BLF14082, Réserve Speciale Manombo 24.5 km 228° Farafangana, -23.01583°, 47.719°, alt 30 m, B.L. Fisher et al., 04.22.2006, (1w, CASC, CASENT0071633);
Paratypes: 21 workers, 16 gynes, and one male from the same locality under CASENT codes:
CASENT0071611, collection code: BLF14077, (1w, 1Q, CASC); CASENT0071616, collection code: BLF14066, (1w, CASC, CASENT0071616); CASENT0071632, collection code: BLF14076, (1w, 1Q, CASC); CASENT0071639, collection code: BLF14100, (1w, CASC); CASENT0071640, collection code: BLF14081, (1w, 1Q, CASC); CASENT0071644, collection code: BLF14073, (1w, 1Q, CASC); CASENT0071646, collection code: BLF14074, (1w, 1Q, CASC); CASENT0071647, collection code: BLF14071, (1w, 1Q, CASC); CASENT0071650, collection code: BLF14111, (1w, CASC); CASENT0071657, collection code: BLF14083, (1w, 1Q, CASC); CASENT0071658, collection code: BLF14067, (1w, CASC); CASENT0071662, collection code: BLF14064, (1w, 1Q, CASC); CASENT0071667, collection code: BLF14078, (1w, CASC); CASENT0071668, collection code: BLF14079, (1w, 1Q, CASC); CASENT0071673, collection code: BLF14072, (1w, 1Q, CASC); CASENT0071676, collection code: BLF14070, (1w, CASC); CASENT0071714, collection code: BLF14084, (1w, 1Q, CASC); CASENT0071720, collection code: BLF14069, (1w, CASC); CASENT0071721, collection code: BLF14080, (1w, 1Q, CASC); CASENT0071725, collection code: BLF14075, (1w, CASC); CASENT0071656, collection code: BLF14068, (1w, 1m, CASC); CASENT0071675, collection code: BLF14063, (1Q, CASC); CASENT0071645, collection code: BLF14073, (1Q, CASC); CASENT0071636, collection code: BLF14076, (1Q, CASC); CASENT0071659, collection code: BLF14083, (1Q, CASC);
The name (minutus) refers to the small tiny appearance of workers of this species.
Description of workers. Body color: yellow. Body color pattern: body concolorous, first gaster tergite darker. Absolute cephalic size: 469 [405, 530]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.30 [1.22, 1.36]. Postocular distance vs. cephalic length (PoOc/CL): 0.52 [0.51, 0.54]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture imbricate, shiny. Setal pits on head dorsum: inconspicuous with obscure demarcation. Gena contour line in frontal view shape: convex. Genae contour from anterior view orientation: converging. Gena sculpture: rugoso-reticulate with areolate ground sculpture; ground sculpture areolate, main sculpture costulate. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.25 [0.22, 0.28]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.36 [0.33, 0.39]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.57 [0.53, 0.61]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: imbricate, main sculpture absent. Lateral region of pronotum sculpture: imbricate, main sculpture absent; inconspicious areolate ground sculpture, main sculpture dispersed costate. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.22 [0.20, 0.23]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.33 [0.30, 0.35]. Dorsal region of postpetiole sculpture: ground sculpture smooth, main sculpture absent. Surface of the first gastral tergite: imbricate sculpture absent.
Nesomyrmex minutus sp. n. holotype worker (CASENT0071633). Head in full-face view (34), dorsal view of the body (35), lateral view of the body (36).
This species is known from rainforests of a single locality in the southeastern coast of Madagascar (Fig.
Holotype: CASENT0418448, collection code: BLF04604, Forêt de Kirindy, 15.5 km 64° ENE Marofandilia, -20.045°, 44.66222°, alt 100 m, Fisher-Griswold Arthropod Team, 11.28.2001, (1w, CASC, CASENT0418448);
Paratypes: four workers from the same locality under CASENT codes: CASENT0418445, collection code: BLF04604, (3w, CASC); CASENT0418446, collection code: BLF04604, (1w, CASC);
MADAGASCAR: CASENT0002644, collection code: BLF06141, Forêt de Beroboka, 5.9 km 131° SE Ankidranoka, -22.23306°, 43.36633°, alt 80 m, Fisher-Griswold Arthropod Team, 03.12.2002, (2w, CASC, CASENT0002644); CASENT0004025, collection code: BLF05637, 6.1 km 182° S Marovato, -25.58167°, 45.295°, alt 20 m, Fisher-Griswold Arthropod Team, 02.14.2002, (1w, CASC); CASENT0156889, collection code: BLF23048, Réserve forestière Beanka, 50.7 km E Maintirano, -17.88021°, 44.46877°, alt 140 m, B.L.Fisher et al., 10.30.2009, (2w, CASC); CASENT0206506, collection code: MG-33-03, Sofia Region,District of Port-Berger, Ambovomamy 20Km N of Port-Berger, Mahajanga, -15.45117°, 47.61333°, alt 86 m, M.F. Rin’ha, 01.21.2007, (1w, CASC); CASENT0447338, collection code: BLF05968, Forêt de Tsinjoriaky, 6.2 km 84° E Tsifota, -22.80222°, 43.42067°, alt 70 m, Fisher-Griswold Arthropod Team, 03.06.2002, (2w, CASC); CASENT0484806, collection code: BLF07511, Parc National de Zombitse, 19.8 km 84° E Sakaraha, -22.84333°, 44.71°, alt 770 m, Fisher, Griswold et al., 02.05.2003, (3w, CASC); MCZENT0576250, Ranomafana National Park, -21.32°, 47.39°, alt 900 m, W.E. Steiner, 01.02.1990, (1w, MCZC);
This name (punctaticeps) refers to conspicuously foveolate head dorsum of workers of this species.
Description of workers. Body color: yellow. Body color pattern: concolorous. Absolute cephalic size: 473 [424, 549]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.20 [1.14, 1.26]. Postocular distance vs. cephalic length (PoOc/CL): 0.49 [0.47, 0.51]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture imbricate, shiny. Setal pits on head dorsum: surrounded by conspicuous foveae with well demarcated margins. Diameter of foveae on head dorsum: 10 µm. Gena contour line in frontal view shape: convex. Genae contour from anterior view orientation: converging. Gena sculpture: rugoso-reticulate with areolate ground sculpture. Concentric carinae laterally surrounding antennal foramen count: present. Eye length vs. absolute cephalic size (EL/CS): 0.24 [0.22, 0.26]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.33 [0.32, 0.35]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.66 [0.62, 0.70]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: ground sculpture areolate, main sculpture absent. Lateral region of pronotum sculpture: ground sculpture areolate, main sculpture absent. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.22 [0.21, 0.24]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.34 [0.30, 0.36]. Dorsal region of postpetiole sculpture: ground sculpture areolate, main sculpture absent. Surface of the first gastral tergite: incontinuously imbricate.
Nesomyrmex punctaticeps sp. n. holotype worker (CASENT0418448). Head in full-face view (38), dorsal view of the body (39), lateral view of the body (40).
This species is widely distributed in Madagascar’s tropical dry forests and spiny forests (Fig.
Holotype: CASENT0428261, collection code: BLF02859, Réserve Spéciale de l’Ankarana, 22.9 km 224° SW Anivorano Nord, -12.90889°, 49.10983°, alt 80 m, Fisher, Griswold et al., 02.10.2001, (1w, CASC, CASENT0428261);
Paratypes: four workers from the same locality under CASENT codes: CASENT0422623, collection code: BLF02859, (1w, CASC); CASENT0422624, collection code: BLF02859, (1w, CASC); CASENT0428262, collection code: BLF02859, (1w, CASC); CASENT0422621, collection code: BLF2859, (1w, CASC);
MADAGASCAR: CASENT0004813, collection code: ANTC1302, P.N. Masoala, 40 km 154° SSE Maroantsetra, -15.72667°, 49.95667°, alt 150 m, A. Dejean et al., 10.14.2001, (2w, CASC); CASENT0053591, collection code: MA-02-09B-53, radio tower, Ranomafana National Park, Fianarantsoa Prov., -21.25083°, 47.40717°, alt 1130 m, M. Irwin, R. Harin’Hala, 02.18.2003, (1w, CASC); CASENT0068333, collection code: BLF12740, Res. Ambodiriana, 4.8 km 306°Manompana, along Manompana river, -16.67233°, 49.70117°, alt 125 m, B.L.Fisher et al., 11.18.2005, (1w, CASC); CASENT0070953, collection code: BLF13926, Réserve Forestière d’Agnalazaha, Mahabo, 42.9 km 215° Farafangana, -23.19383°, 47.723°, alt 20 m, B.L. Fisher et al., 04.19.2006, (1w, CASC); CASENT0071722, collection code: BLF14065, Réserve Speciale Manombo 24.5 km 228° Farafangana, -23.01583°, 47.719°, alt 30 m, B.L. Fisher et al., 04.22.2006, (1w, CASC); CASENT0189193, collection code: BLF01998, R.S. Manongarivo, 10.8 km 229° SW Antanambao, -13.96167°, 48.43333°, alt 400 m, B.L.Fisher, 11.08.1998, (1w, CASC); CASENT0262171, collection code: MG-58-30, SAVA Region,Distric of Vohemar, Antsahabelela Rain Forest,9 km SW of Daraina, -13.2505°, 49.61667°, alt 182 m, Mike, Rin’ha, 04.27.2011, (1w, CASC); CASENT0422618, collection code: BLF02660, Réserve Spéciale de l’Ankarana, 22.9 km 224° SW Anivorano Nord, -12.90889°, 49.10983°, alt 80 m, Fisher, Griswold et al., 02.10.2001, (1w, CASC); CASENT0422620, collection code: BLF02660, Réserve Spéciale d’Ambre, 3.5 km 235° SW Sakaramy, -12.46889°, 49.24217°, alt 325 m, Fisher, Griswold et al., 01.26.2001, (1w, CASC); CASENT0494407, collection code: BLF09906, Forêt de Bekaraoka, 6.8 km 60° ENE Daraina, -13.16667°, 49.71°, alt 150 m, B.L.Fisher, 12.07.2003, (1w, CASC, CASENT0494407);
The name (sellaris) refers to the deep mesopropodeal depression in workers resembling a saddle (=sella Lat.).
Description of workers. Body color: yellow. Body color pattern: concolorous. Absolute cephalic size: 449 [410, 557]. Cephalic length vs. maximum width of head capsule (CL/CWb): 1.18 [1.13, 1.25]. Postocular distance vs. cephalic length (PoOc/CL): 0.51 [0.49, 0.53]. Postocular sides of cranium contour frontal view orientation: converging posteriorly. Postocular sides of cranium contour frontal view shape: broadly convex. Vertex contour line in frontal view shape: straight. Vertex sculpture: main sculpture absent, ground sculpture imbricate, shiny. Setal pits on head dorsum: surrounded by conspicuous foveae with well demarcated margins. Diameter of foveae on head dorsum: 10–15 µm. Gena contour line in frontal view shape: straight. Genae contour from anterior view orientation: converging. Gena sculpture: rugoso-reticulate with areolate ground sculpture. Concentric carinae laterally surrounding antennal foramen: present. Eye length vs. absolute cephalic size (EL/CS): 0.24 [0.23, 0.26]. Frontal carina distance vs. absolute cephalic size (FRS/CS): 0.29 [0.27, 0.30]. Longitudinal carinae on median region of frons: absent. Smooth median region on frons: present. Antennomere count: 12. Scape length vs. absolute cephalic size (SL/CS): 0.69 [0.65, 0.72]. Median clypeal notch: present. Ground sculpture of submedian area of clypeus: present. Median carina of clypeus: absent. Metanotal depression: present. Dorsal region of mesosoma sculpture: imbricate, main sculpture absent. Lateral region of pronotum sculpture: imbricate, main sculpture absent; inconspicious areolate ground sculpture, main sculpture dispersed costate. Mesopleuron sculpture: ground sculpture areolate, main sculpture absent. Metapleuron sculpture: ground sculpture areolate, main sculpture absent. Petiole width vs. absolute cephalic size (PEW/CS): 0.21 [0.20, 0.23]. Dorsal region of petiole sculpture: ground sculpture areolate, main sculpture absent. Postpetiole width vs. absolute cephalic size (PPW/CS): 0.29 [0.26, 0.31]. Dorsal region of postpetiole sculpture: ground sculpture smooth, main sculpture absent. Surface of the first gastral tergite: incontinuously imbricate; continuously imbricate.
Nesomyrmex sellaris sp. n. holotype worker (CASENT0428261). Head in full-face view (42), dorsal view of the body (43), lateral view of the body (44).
This species is widely distributed in East Madagascar (Fig.
First, we would like to thank Michele Esposito, from CASC, for her enduring support with databasing, imaging processing, proofreading, and her overall support in the lab. We also want to thank Dr. Phil S. Ward from the University of California Davis, U.S.A., for providing additional material collected in Madagascar. Moreover, the fieldwork on which this study is based could not have been completed without the gracious support of the Malagasy people and the Arthropod Inventory Team (Balsama Rajemison, Jean-Claude Rakotonirina, Jean-Jacques Rafanomezantsoa, Chrislain Ranaivo, Hanitriniana Rasoazanamavo, Nicole Rasoamanana, Clavier Randrianandrasana, Dimby Raharinjanahary). Special thanks due to Flavia Esteves for helping in R. This study was supported by the National Science Foundation under Grant No. DEB-0072713, DEB-0344731, and DEB-0842395. Finally, SC was supported by the Schlinger Fellowship at the California Academy of Sciences and an Ernst Mayr Travel Grants to the Museum of Comparative Zoology, Cambridge, Massachusetts (U.S.A.).