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A new species of the genus Aeneator Finlay, 1926 is described from off the coast of Caldera (27°S), northern Chile. Aeneator martae sp. n. has a small, broad, stout, angulated shell with more prominent axial ribs and a more obviously keeled periphery than all previously named Chilean species. Comparisons are provided with all other South American named species of Aeneator.
New taxa, East Pacific, deep water
The genus Aeneator Finlay, 1926 comprises a group of deep-water gastropods of moderate size, distributed in the South Pacific Ocean around New Zealand (
In the southeastern Pacific the genus encompasses five extant species: Aeneator castillai McLean & Andrade, 1982, Aeneator fontainei (d’Orbigny, 1839), Aeneator (Ellicea) loisae Rehder, 1971, Aeneator portentosus Fraussen & Sellanes, 2008 and Aeneator prognaviter Fraussen & Sellanes, 2008. The distribution of these species ranges from Bahía Independencia (14°S), in the south of Peru to Canal Moraleda 45°22'S, southern Chile (
The present work describes a new species of Aeneator from northern Chile based on shell morphological features. Criteria were shell shape, number of primary spiral cords, development of secondary spirals, and axial sculpture. An identification key, based on shell characters, is given for all the extant Chilean Aeneator species.
Material examined: Aeneator martae sp. n. types, Chile, Region of Atacama, Caldera, holotype MZUC 37890, paratype 1 MZUC 37891, paratype 2 MZUC 37892, paratype 3 MG 200105.
Examination was made of shell only specimens; all measurements were made with vernier callipers (± 0.1 mm). For the measure of length of aperture and angle of the spire, the methodology of
Abbreviations: KF; Private collection of Mr Koen Fraussen, Aarschot, Belgium, MG: private collection of the author, section marine Gastropoda, MZUC; Museo de Zoología de la Universidad de Concepción, Concepción, Chile, RC Coll; private collection of Mr Ricardo Catalán, Servicio Nacional de Pesca, Chile.
Class: Gastropoda Cuvier, 1797
Order: Neogastropoda Wenz, 1938
Superfamily: Buccinoidea Rafinesque, 1815
Family: Buccinidae Rafinesque, 1815
Genus: Aeneator Finlay, 1926:414
Type species. Verconella marshalli Murdoch 1924 (by original designation), Pleistocene and recent, New Zealand.
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http://species-id.net/wiki/Aeneator_martae
Figs 1–14, 18, Tables 1, 2, 3Holotype (MZUC 37890), 47.9 mm. Chile, off Caldera (27°04'S, 70°50'W), 550–600 m depth, live collected on shrimp trawl nets, January 2001, S. Castillo leg. Paratype 1 (MZUC 37891), length 44.0 mm. Paratype 2 (MZUC 37892), 41.7 mm, Paratype 3 (MG 200105), length 40.2 mm. All the paratypes with same locality as the holotype.
Known only from the type locality; Chile, Region de Atacama, Caldera (27°04'S, 70°50'W), 550–600 m depth.
A small species of Aeneator, height up to 47.9 mm, shell stout, inside of aperture pale orange, exterior sculptured by well-defined axial ribs, spiral cords, and a conspicuous stepped shoulder.
Shell small for genus (height up to 47.9 mm, Table 1), thick, solid, fusiform, chalky white to pale brownish, inside of aperture pale orange. Shape broad, angulate, length of aperture and canal more than half length of shell, width/height ratio 0.53 to 0.56, whorls convex apart from slightly concave sutural ramp, suture shallow but impressed. Spire angle 63° to 68°. Protoconch and upper teleoconch whorls missing, remaining whorls about 4.5, last 3 with sculpture intact with 7–9 primary spiral cords, interspaces each occupied by one narrow, well defined secondary cord. Last whorl with 16–18 spiral cords, more prominent at periphery of shell than elsewhere, forming a distinct keel. Spire whorls with 24–28 pronounced axial ribs, interspaces deep, each almost equal to a rib in width. Last whorl with 14–15 such ribs. Ribs more pronounced towards the anterior end of shell. Aperture ovate. Parietal and columellar area well-defined, glazed; outer lip thin, slightly crenulated, without lirae or teeth. Siphonal canal short, open, directed slightly to left. Operculum large, thin, dark brown, elongate, nucleus terminal, tip sharp.
Aeneator martae sp. n. measurements of specimens. (%) means percentage compared to the total length of the shell.
Maximum length (mm) | Maximum width (mm) | Length of aperture | Width/Length | |
---|---|---|---|---|
Holotype | 47.9 | 25.6 | 26.8 (56 %) | 0.53 |
Paratype 1 | 44.0 | 23.6 | 27.9 (57 %) | 0.54 |
Paratype 2 | 41.7 | 23.4 | 23.0 (57 %) | 0.56 |
Paratype 3 | 40.2 | 22.1 | 22.6 (56 %) | 0.55 |
Average | 43.4 | 23.6 | 25.1 (56 %) | 0.54 |
Aeneator martae sp. n. shell, Holotype 47.9 mm, Chile, Off Caldera, 27°04'S, 70°50'W. 550–600 m. MZUC 37890.
Aeneator martae sp. n. shells. 6–8 Paratype 1 (MZUC 37891), 44.0 mm height 9–11 Paratype 2 (MZUC 37892), 41.7 mm height 12–14 Paratype 3 (MG 200105), 40.2 mm height.
Details of shell sculpture of ChileanAeneator species. 15 Aeneator castillai (RC Coll.), 85.7 mm 16 Aeneator fontainei (RC Coll.), 48.0 mm 17 Aeneator loisae (MG 200003), 78 mm 18 Aeneator martae sp. n. paraype 3 (MG 200105), 40.2 mm 19 Aeneator portentosus, Paratype KF-0338, 45.5 mm 20 Aeneator prognaviter (MG 200124), 33, 0 mm.
Named in honour of Mrs Marta Araya, Caldera, Chile, who presented the specimens to the author.
In Chile the genus Aeneator encompasses five extant species: Aeneator castillai, found from Coquimbo (29°55'S) to Punta Peñablanca (33°22'S) in 200–450 m (
Synthesis of characters of the Chilean species of Aeneator Finlay, 1926 based on
Aeneator castillai | Aeneator fontainei | Aeneator loisae | Aeneator portentosus | Aeneator prognaviter | Aeneator martae sp. n. | |
---|---|---|---|---|---|---|
Length | 85.7 | 85.8 | 104 | 45.5 | 32.2 | 47.9 |
Width / Length | 0.50–0.51 | 0.48–0.54 | 0.43–0.48 | 0.49–0.59 | 0.55 – 0.60 | 0.54–0.56 |
Aperture length/ total length | 0.55–0.63 | 0.55–0.56 | 0.54 – 0.56 | 0.43–0.52 | 0.49 – 0.53 | 0.55–0.56 |
Spire angle | 50° | 51°–57° | 44°–46° | 44°–51° | 60° | 63°–68° |
Axial ribs on last whorl | 16, absent in subsutural area | 12–15 | Faint, absent | Faint, absent | 22, bent | 14–15, straight |
Spiral cords in last whorl | 12 – 15 brown primary, 1–3 secondary in each interspace | 12–15 brown primary, 3–5 secondary in each interspace | 9–10 primary, many secondary | 20 | 20–24 | 16–18 primary, 7–9 secondary |
Siphonal canal | short, twisted | medium to long, straight | long | short, broad, slightly bent | short, broad | short, slightly curved to left |
Aperture | ovate | ovate | elongate ovate | round | oval | oval |
Shell color | brown | white - yellowish | white | snow white | snow white | white, pale brownish |
Distribution | 29°55'S to 39.1°S | 14°13'S to 46°S | 27°04'S to 53.7°S | 21.19°S and 29.95°S | 21°19'S and 22°51'S | 27°04'S |
Table of localities of Chilean species of Aeneator Finlay, 1926 based on
Species | Latitude | Longitude | Depth (m) |
---|---|---|---|
Aeneator castillai | 29°55'S to 33°22'S | 71°53'W to 71°20'W | 200–450 |
Aeneator fontainei | 14°14'S to 46°05'S | 76°11'W to 73°41'W | 10–421 |
Aeneator loisae | 27°04'S to 45°22'S | 73°21'W to 70°50'W | 200–465 |
Aeneator martae | 27°04'S | 70°50'W | 550–600 |
Aeneator portentosus | 21°19'S to 29°55'S | 71°20'W to 70°09'W | 800 |
Aeneator prognaviter | 21°19'S to 22°51'S | 70°24'W to 70°09'W | 600–748 |
Aeneator fontainei varieties and details of shell sculpture. 21–22 Off Coquimbo, Chile, trawled 421 m (RC Coll), 58 mm 23–24 Washed ashore, Calderilla beach, Caldera, Chile (MG 200011), 28.5 mm 25–26 Dredged 20 m depth off Loreto beach, Caldera, Chile (MG 200012), 52.8 mm.
Aeneator loisae varieties and details of shell sculpture 27–28 Off Caldera, Chile, 450–500 m depth (MG 200003), 78 mm 29–30 Off Caldera, Chile, 420 m depth (MG 200007) 71.9 mm 31–32 Off Coquimbo, Chile, 400 m depth (RC Coll.), 104 mm
In size, the shell of Aeneator martae sp. n. is similar to Aeneator prognaviter (Figs 20, 37, 38) and Aeneator portentosus (Figs 35, 36). However, the former of these two can be clearly differentiated from the new species by its wider and shorter siphonal canal, less numerous and more curved axial ribs and a thinner, snow white shell (
Aeneator species and details of shell sculpture. 33–34 Aeneator castillai, off Coquimbo, Chile, 380 m depth (RC Coll.), 85.7 mm 35–36 Aeneator portentosus, Paratype KF-0338, 45.5 mm 37–38 Aeneator prognaviter, off Iquique, Chile, 748 m depth (MG 200124), 33, 0 mm.
Aeneator castillai (Figs 33, 34), and Aeneator fontainei (Figs 21–26) differ markedly from the new species by their much larger shells, reaching up to 85.8 mm, more fusiform shells, with a much less stepped or indistinct shoulder, lower and fewer axial ribs, brown primary spiral cords (Figs 15, 16) and lip lirated within. The spiral sculpture is quite different; Aeneator fontainei has 13 to 16 dark brown major cords, with interspaces filled with five secondary cords separated by fine grooves or by secondary and tertiary cords. Aeneator castillai has brown primary cords with 3 to 5 fine secondary cords filling the interspaces and exhibits a longer, twisted, siphonal canal. In contrast Aeneator martae sp. n. lacks any brown coloration, shows a sculpture of alternated single major and minor spiral cords defined mostly in the posterior part of the whorls, and has a conspicuous stepped shoulder, forming a keel at the periphery.
Aeneator loisae (Figs 27–32) differs from the new species in having a larger, up to 104 mm, white to snow white shell (different from the white to light brown shell of Aeneator martae sp. n.), more inflated last whorl, with a much longer siphonal canal, a higher number of primary and secondary spiral cords, more prominent spiral sculpture, and fewer, more tenuous, axial ribs.
The new species is tentatively assigned, given the generic uncertainties within the Chilean species, to the genus Aeneator
In a recent revision of the fossil fauna of Mejillones, north of Chile (
Further study of radular characters, comparative anatomy and DNA will improve the taxonomic placement of the Chilean species. Fossil studies would also give a general insight into the development of the genus and their relationships with the South Pacific related fauna, especially those from New Zealand and adjacent waters.
Aeneator castillai, Chile, Region of Coquimbo, Coquimbo, 2 specimens RC Coll. Aeneator fontainei, Chile, Region of Atacama, Caldera, 3 specimens MG 200011–200013, 5 specimens RC Coll. Aeneator loisae, Chile, Region of Atacama, Chile, 4 specimens MG 200003–200006, 1 specimen RC Coll, Aeneator prognaviter, 2 specimens MG 200124–200125, Aeneator portentosus, 1 specimen (examined from images), KF-0338.
1 | Aperture ovate-elongate | 2 |
– | Aperture rounded, shell pagodoid, periostracum sculptured | Aeneator portentosus Fraussen & Sellanes, 2008 |
2(1) | Siphonal canal short | 3 |
– | Siphonal canal long, outer lip reflexed, shell elongated | Aeneator loisae Rehder, 1971 |
3(2) | Spiral cords brown | 5 |
– | Spiral cords white, axial ribs thick, shell length up to 49 mm | 4 |
4(3) | Siphonal canal broad, axial ribs strongly curved | Aeneator prognaviter Fraussen & Sellanes, 2008 |
– | Shell with a distinct keel, aperture almost subquadrate | Aeneator martae sp. n. |
5(3) | Axial ribs on subsutural area | Aeneator fontanei (d’Orbigny, 1841) |
– | Sculpture absent on subsutural area, siphonal canal twisted | Aeneator castillai MacLean & Andrade, 1982 |
The author wishes to thank Mrs Sandra Castillo for collecting the specimens in situ, Mr Koen Fraussen (Aarschot, Belgium) for sending bibliography and images of the paratype of Aeneator portentosus, commenting about the genus, and reviewing the manuscript. I am grateful to Dr. Guillermo Guzmán (Museo del Mar, Universidad Arturo Prat, Chile) for helping with the specimens of Aeneator prognaviter, Sergio Miquel (Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Buenos Aires, Argentina) for his comments on the early manuscript, Dr. Sven Nielsen (Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Kiel, Germany) for sending useful bibliography, Mr Ricardo Catalán (Servicio Nacional de Pesca, Chile) for loaning Aeneator specimens for examination from his personal collection, Dr. Alan G. Beu (GNS Science, Lower Hutt, New Zealand) for his comments on the genus, help with essential bibliography, and for his comments and correction of the manuscript. Finally, I would like to thank the reviewers and the associate editor for their very helpful suggestions on the manuscript and the Encyclopedia of Life (EOL) Open Access Support Project (EOASP) for supporting the open access of this paper.