Ancylodactyla nana Galil 2004, n. comb.
Creators: name: Galil, Bella S.
Publisher: name: Zenodo
Year: 2004
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Leucosiidae
Ancylodactyla
Ancylodactyla nana

description: Ancylodactyla nana (Zarenkov, 1990) n. comb.
(Figs 1C; 2C)
Randallia nana Zarenkov, 1990: 220, pl. 3.
MATERIAL EXAMINED. — New Caledonia. CHALCAL, Coriolis, stn CP 11, 20°04.40’S, 158°47.41’E, 300 m, 22.VII.1984, 4 5.9-6.9 mm cl.; 1 6.9 mm cl. (MNHN B18429). — BIOCAL, stn DW 38, 23°00’S, 167°15’E, 360 m, 30.VIII.1985, 1 7.5 mm cl. (MNHN B18413). — BIOCAL, stn CP 42, 23°46’S, 167°13’E, 380 m, 30.VIII.1985, 10 6.2-8.3 mm cl.; 7 5.6-8.3 mm cl.; 2 juvs (MNHN B18397). — MUSORSTOM 4, stn 171, 18°57.8’S, 163°14.0’E, 425 m, 17.IX.1985, 14 6.3-7.7 mm cl.; 9 6.0- 8.7 mm cl.; 4 juvs (MNHN B18395). — MUSORSTOM 4, stn 174, 19°00.3’S, 163°18.5’E, 365 m, 17.IX.1985, 4 6.6-8.1 mm cl. (MNHN B19179). — MUSORSTOM 5, stn 305, 22°09.27’S, 159°24.42’E, 430-440 m, 12.X.1986, 1 5.5 mm cl. (MNHN B18462). — MUSORSTOM 5, stn 329, 20°22.9’S, 158°46.50’E, 320 m, 15.X.1986, 3 5.2-6.8 mm cl.; 6 5.1-7.1 mm cl. (MNHN B18447). — MUSORSTOM 5, stn 334, 20°06.27’S, 158°47.62’E, 315-320 m, 15.X.1986, 3 5.4- 7.5 mm cl.; 8 5.2-6.8 mm cl. (MNHN B18445). — MUSORSTOM 5, stn 352, 19°31.40’S, 158°37.70’E, 310-337 m, 17.X.1986, 1 8.1 mm cl. (MNHN B18393). — MUSORSTOM 5, stn 353, 19°26.50’S, 158°40.40’E, 290 m, 18.X.1986, 1 5.5 mm cl.; 1 6.2 mm cl. (MNHN B18391). — MUSORSTOM 5, stn 354, 19°31.06’S, 158°42.56’E, 420-450 m, 18.X.1986, 1 6.6 mm cl. (MNHN B18392). — MUSORSTOM 5, stn 378, 19°53.74’S, 158°38.30’E, 355 m, 20.X.1986, 2 6.3, 6.9 mm cl.; 1 7.3 mm cl. (MNHN B18390). — SMIB 3, stn DW 23, 22°58’S, 167°20’E, 530 m, 24. V.1987, 1 7.1 mm cl. — VOLSMAR, stn DW 16, 22°25.1’S, 171°40.7’E, 500 m, 3. VI.1989, 1 5.3 mm cl. — SMIB 6, Grande Passage, stn DW 137, 19°00.3’S, 163°18.3’E, 305-330 m, 3.III.1990, 1 7.4 mm cl. — BATHUS 2, stn DW 724, 22°47.85’S, 167°25.77’E, 344-358 m, 11. V.1993, 3 5.5-7.3 mm cl. — BATHUS 2, stn DW 730, 23°02.56’S, 166°58.30’E, 397-400 m, 12. V.1993, 20 5.6-8.4 mm cl.; 18 6.5- 8.0 mm cl. — BATHUS 2, stn DW 737, 23°03.42’S, 166°39.97’E, 350-400 m, 13. V.1993, 2 9.3, 8.2 mm cl.; 1 ovigerous 7.9 mm cl. — BATHUS 3, Norfolk ridge, stn DW 829, 23°21’S, 166°02’E, 386- 390 m, 29.XI.1993, 1 5.8 mm cl. — BATHUS 3, Norfolk ridge, stn DW 836, 23°02’S, 166°59’E, 295- 306 m, 30.XI.1993, 3 8.0- 7.7 mm cl. — BATHUS 3, Norfolk ridge, stn DW 838, 23°01’S, 166°56’E, 400-402 m, 30.XI.1993, 4 5.4-8.2 mm cl.; 2 5.5, 7.8 mm cl. — HALIPRO 1, stn CH 879, 23°03’S, 167°02’E, 350 m, 3.III.1994, 1 8.5 mm cl. — BATHUS 4, stn DW 903, 18°59.93’S, 163°13.55’E, 386-400 m, 4.VIII.1994, 5 8.0- 8.8 mm cl.; 14 6.5-7.9 mm cl.
Fiji. BORDAU 1, stn CP 1478, 20°59’S, 178°44’E, 386-396 m, 9.III.1999, 34 6.6-8.4 mm cl.; 28 6.6-8.3 mm cl.
Coral Sea. CHALCAL, stn CP 4, Chesterfield-Bellona Plateau, 19°33.90’S, 158°37.90’E, 350-370 m, 1984, 2 7.1, 8.6 mm cl. (MNHN B19236).
Tonga. BORDAU 2, stn CP 1545, 21°17’S, 175°17’W, 444-447 m, 5. VI.2000, coll. Bouchet, Warén & Richer de Forges, 1 7.5 mm cl. — BORDAU 2, stn CP 1590, 19°12’S, 174°13’W, 353- 386 m, 4. VI.2000, coll. Bouchet, Warén & Richer de Forges, 2 7.3, 7.5 mm cl. — BORDAU 2, Ha’apai group, stn CP 1593, 19°06’S, 174°18’W, 436-442 m, 14. VI.2000, coll. Bouchet, Warén & Richer de Forges, 1 7.3 mm cl. — BORDAU 2, stn CP 1606, 22°16’S, 175°20’W, 313-316 m, 16. VI.2000, coll. Bouchet, Warén & Richer de Forges, 1 6.5 mm cl. — BORDAU 2, stn CP 1609, 22°11’S, 175°27’W, 385-405 m, 16. VI.2000, coll. Bouchet, Warén & Richer de Forges, 3 5.5- 7.4 mm cl.; 1 6.1 mm cl. — BORDAU 2, stn CP 1613, 23°03’S, 175°47’W, 331-352 m, 17. VI.2000, coll. Bouchet, Warén & Richer de Forges, 2 5.9, 8.0 mm cl. — BORDAU 2, stn CP 1628, 23°22’S, 176°18’W, 400-416 m, 19. VI.2000, coll. Bouchet, Warén & Richer de Forges, 10 5.4-8.4 mm cl.; 12 5.4-7.0 mm cl.; 5 juvs. — BORDAU 2, stn CP 1632, 22°01’S, 175°42’W, 613-618 m, 20. VI.2000, coll. Bouchet, Warén & Richer de Forges, 1 6.3 mm cl. — BORDAU 2, stn CP 1643, 21°05’S, 175°22’W, 487 m, 22. VI.2000, coll. Bouchet, Warén & Richer de Forges, 2 5.6, 7.1 mm cl.
DISTRIBUTION. — New Caledonia, Fiji, Coral Sea, Tonga, Sala-y-Gomez and Nazca ridges; 218-618 m depth.
DESCRIPTION
Dorsal surface of carapace uniformly paved with minute flattened granules. Frontal lobes subtruncate, slightly concave. Hepatic region slightly tumid. Anterolateral margins medially constricted. Epibranchial lobe convex, prominent; margin carinate, beaded. Intestinal region slightly inflated, laterally demarked by shallow grooves. Posterior margin lamellar. Anterior margin of efferent branchial channel narrowly slit medially. Third maxilliped minutely granulate. Chelipeds minutely granulate; merus in adult male about 1.5 as long as carapace; fingers 0.7 as long as propodus. Lower margin of propodus of first pereiopod smooth. Abdominal sternites, somites closely set with minute granules. Subdistal denticle on fused male abdominal segment lozenge-shaped. Male first pleopod distally angled distad, margin of proximal lobe setose; second pleopod curved, distally coiled.
REMARKS
The description and the illustrations of the specimens identified by Zarenkov (1990) as Randallia nana differ from Randallia s.s. (Galil 2003) in having the antennular operculum sealing only the lower part of the antennular aperture, the anterior margin of efferent branchial channel bilobate rather than trilobate, and the segments 3-6 of the male abdomen fused, rather than segments 3-5.
Ancylodactyla nana n. comb. differs from A. elongata n. comb. in its finer granulation on the carapace, lozenge-shaped rather than bidentate subdistal denticle on fused male abdominal segment, and distally coiled second male pleopod. It differs from A. elata n. comb. in lacking lamellate epibranchial margins. These findings greatly increase the known range of the species.
description: Published as part of Galil, Bella S., 2004, A new deep water leucosiid genus (Crustacea, Decapoda, Brachyura), pp. 495-502 in Zoosystema 26 (3) on pages 499-501, DOI: 10.5281/zenodo.4689549