Ancylodactyla elongata ( Zarenkov, 1969 ) Galil, 2004

Galil, Bella S., 2004, A new deep water leucosiid genus (Crustacea, Decapoda, Brachyura), Zoosystema 26 (3), pp. 495-502 : 497-499

Ancylodactyla elongata ( Zarenkov, 1969) n. comb.

( Figs 1B ; 2B )

Praebebalia elongata Zarenkov, 1969: 19 , figs 1.3, 4. — Chen 1989: 192.

Praebebalia semblatae Chen, 1989: 192 , fig. 31e, pl. 5.1. — Tan 1996: 1023.

Praebebalia bidentata Chen & Sun, 2002: 268 , fig. 116. MATERIAL EXAMINED. — Philippines. MUSORSTOM 3, stn DR 126, 11°49’N, 121°22’E, 266 m, 4.VI.1985, 1 4.6 mm cl. (MNHN B17975), holotype of Praebebalia semblatae Chen, 1989 .

Indonesia. Tanimbar I., KARUBAR, stn DW 50, 07°59’S, 133°02’E, 184-186 m, 29.X.1991, 1 4.9 mm cl .; 1 4.7 mm cl.

New Caledonia. BATHUS 2, stn DW 717, 22°44.02’S, 167°16.58’E, 350-393 m, 11.V.1993, 3 4.2-5.2 mm cl .; 3 4.3-4.8 mm cl. — BATHUS 2, stn DW 724, 22°47.85’S, 167°25.77’E, 344-358 m, 11.V.1993, coll. Richer de Forges , 1 5.4 mm cl. — BATHUS 4, stn DW 941, 19°02.03’S, 163°26.93’E, 270 m, 8.VIII.1994, coll. Richer de Forges, 1 4.3 mm cl. — BATHUS 4, stn DW 942, 19°04.26’S, 163°27.36’E, 270- 264 m, 8.VIII.1994, coll. Richer de Forges, 5 4.6-5.1 mm cl .; 19 4.0- 4.9 mm cl. — BATHUS 4, stn DW 902, 19°00.84’S, 163°14.83’E, 341-351 m, 4.VIII.1994, coll. Richer de Forges , 1 5.6 mm cl .

Loyalty Islands. MUSORSTOM 6, stn DW 399, 21°41.80’S, 167°00.20’E, 282 m, 14.II.1989, 1 5.1 mm cl. — MUSORSTOM 6, stn DW 453, 21°00.50’S, 167°26.90’E, 250 m, 20.II.1989, 1 4.8 mm cl. — BATHUS 2, stn DW 730, 23°02.56’S, 166°58.30’E, 397-400 m, 12. V.1993, 1 3.6 mm cl.

Tonga. Tongatapu, BORDAU 2, stn CP 1509, 21°05’S, 175°22’W, 456-510 m, 31.V.2000, coll. Bouchet, Warén & Richer de Forges, 1 4.8 mm cl. — Eua I., BORDAU 2, stn CP 1525, 21°17’S, 174°59’W, 349-351 m, 2.VI.2000, coll. Bouchet, Warén & Richer de Forges, 3 3.7-5.6 mm cl. — BORDAU 2, stn CP 1538, 21°39’S, 175°19’W, 471- 508 m, 4.VI.2000, coll. Bouchet, Warén & Richer de Forges , 1 5.6 mm cl .; 1 5.5 mm cl. — BORDAU 2, stn CP 1541, 21°15’S, 175°14’W, 319-333 m, 5.VI.2000, coll. Bouchet, Warén & Richer de Forges, 1 5.0 mm cl. — BORDAU 2, stn CP 1543, 21°16’S, 175°18’W, 427-436 m, 5.VI.2000, coll. Bouchet, Warén & Richer de Forges, 1 5.0 mm cl. — Tongatapu, BORDAU 2, stn CP 1547, 21°24’S, 175°18’W, 488-491 m, 5.VI.2000, coll. Bouchet, Warén & Richer de Forges , 1 5.3 mm cl. — BORDAU 2, stn CP 1602, 20°49’S, 174°57’W, 263- 320 m, 15.VI.2000, coll. Bouchet, Warén & Richer de Forges , 1 5.3 mm cl. — BORDAU 2, stn CP 1617, 23°03’S, 175°53’W, 483-531 m, 17.VI.2000, coll. Bouchet, Warén & Richer de Forges , 1 4.7 mm cl. — Tongatapu, BORDAU 2, stn CP 1638, 21°05’S, 175°23’W, 469-520 m, 21.VI.2000, coll. Bouchet, Warén & Richer de Forges , 1 5.4 mm cl .

DISTRIBUTION. — South China Sea, Philippines, Indonesia, New Ireland, New Caledonia, Loyalty Islands, Tonga; 156-531 m depth.

DESCRIPTION

Dorsal surface of carapace uniformly paved with minute rounded granules. Frontal lobes subtruncate, slightly concave. Hepatic region slightly tumid. Anterolateral margins medially constricted. Epibranchial lobe convex, prominent; margin prominently granulate. Intestinal region 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 1.6 as long as carapace; fingers 0.7 as long as propodus. Lower margin of propodus of first and second pereiopods in adult males bearing triangular carina medially. Abdominal sternites, somites closely set with minute granules. Subdistal denticle on fused male abdominal segment prominent, medially sulcate. Male first pleopod slightly curved, distally with few marginal setae; second pleopod sinuous, distally curved.

REMARKS

Zarenkov’s (1969) description and illustrations of Praebebalia elongata emphasize the bidentate subdistal denticle on the fused male abdominal segment. The detailed illustrations of P. bidentata ( Chen & Sun 2002) depict the bidentate denticle on the male abdomen, as well as the granulate carapace and cheliped, the keeled lower margin of first pereiopod, and the shape of first and second male pleopods. Examination of Chen’s (1989) single female type specimen of P. semblatae (MNHN B17975) left no doubt that it is identical with A. elongata n. comb. These findings greatly increase the known range of the species.

Figures

FIG. 1. — A, Ancylodactyla elata (Zarenkov, 1994) n. comb., 4.7 mm cl., New Caledonia, BATHUS 1, stn CP 695, 20°34.59’S, 164°57.88’E, 410-430 m, 17.III.1993 (MNHN), dorsal view; B, A. elongata (Zarenkov, 1969) n. comb., 5.1 mm cl., New Caledonia, BATHUS 4, stn DW 942, 19°04.26’S, 163°27.36’E, 270-264 m, 8.VIII.1994 (MNHN), dorsal view; C, A. nana (Zarenkov, 1990) n. comb., 9.3 mm cl., New Caledonia, BATHUS 2, stn DW 737,23°03.42’S, 166°39.97’E, 350-400 m, 13.V.1993 (MNHN),dorsal view.

FIG. 2. — A, Ancylodactyla elata (Zarenkov, 1994) n. comb., 4.7 mm cl., New Caledonia, BATHUS 4, stn CP 946, 20°33.81’S, 164°58.35’E, 386-430 m, 10.VIII.1994 (MNHN), first and second pleopods; B, A. elongata (Zarenkov, 1969) n. comb., 5.1 mm cl., New Caledonia, BATHUS 4, stn DW 942, 19°04.26’S, 163°27.36’E, 270-264 m, 8.VIII.1994 (MNHN), first and second pleopods; C, A. nana (Zarenkov, 1990) n. comb., 9.3 mm cl., New Caledonia, BATHUS 2, stn DW 737, 23°03.42’S, 166°39.97’E, 350-400 m, 13.V.1993 (MNHN), first and second pleopods. Scale bars: 1 mm.