Compressidentalium clathratum (Martens, 1881)

Scarabino, Victor, 2008, New species and new records of scaphopods from New Caledonia, Mémoires du Muséum national d'Histoire naturelle 196, pp. 215-268 : 230

Compressidentalium clathratum (Martens, 1881)

Dentalium clathratum Martens, 1881: 66 .

Other references: Compressidentalium sedecimcostatum - Scarabino 1995: 259, figs 66, 70j (in part, non C. sedecimcostatum Boissevain, 1906 ). Material

cited: 29 lots (159 spms) from north of New Caledonia, Chesterfield Islands, Norfolk Ridge and Loyalty Islands, live in

350-1920 m. Fissidentalium clathratum - Lamprell & Healy 1998: 87, figs 82F, 83F-G, 90, 91A-E.

TYPE MATERIAL EXAMINED. — Holotype (dd) ZMB 33.122 .

TYPE LOCALITY. — Off Moreton Bay , Queensland, Australia, 550 fm [1006 m] .

NEW MATERIAL EXAMINED. — North of New Caledonia. 577-780 m, 4 lv, 12 dd; stn CP 755, 22°22’S, 166°14’E, 495 m, BATHUS 4: stn CP 909, Grand Passage, 18°58’S, 163°10’E, 2 lv, 6 dd; stn DW 757, 22°20’S, 166°13’E, 330 m, 21 lv, 35 516-550 m, 1 dd; stn DW 915, 18°51’S, 163°17’E, 575-580 m, dd; stn CP 760, 22°19’S, 166°11’E, 455 m, 25 dd; stn CP 761, 4 dd; stn DW 918, 18°49’S, 163°16’E, 613-647 m, 5 lv, 14 dd. 22°19’S, 166°10’E, 490-500 m, 4 lv, 5 dd; stn CP 762, 22°19’S, New Caledonia proper. BATHUS 1: stn CP 657, Passe de 166°10’E, 620-700 m, 2 dd; stn DW 763, Passe de Uitoé, 22°10’S, Canala, 21°14’S, 165°55’E, 490-530 m, 1 dd; stn CP 658, 166°03’E, 483-530 m, 2 lv, 5 dd; stn CP 764, 22°09’S, 166°03’E, 21°13’S, 165°55’E, 515-580 m, 1 lv; stn CP 661, Passe du Cap 560-570 m, 3 dd; stn CP 771, 22°10’S, 166°02’E, 610-800 m, 1 Baye, 21°05’S, 165°50’E, 960-1100 m, 4 lv, 57 dd . — BATHUS dd. — HALIPRO 1: stn CP 850, 21°43’S, 166°39’E, 541-580 m, 5 2: stn DW 733, Passe de Kouaré , 22°55’S, 166°49’E, 520 m, dd; stn CP 858, 21°42’S, 166°41’E, 1000-1120 m, 1 dd; stn CP 1 lv, 15 dd; stn DW 739, Passe de Boulari, 22°35’S, 166°27’E, 865, 21°26’S, 166°17’E, 550 m, 3 dd .

465-525 m, 10 dd; stn DW 740, 22°36’S, 166°27’E, 570-605 m, Norfolk Ridge. SMIB 8: stn 182-184, Banc Aztèque, 23°18- 2 lv, 14 dd; stn DW 754, Passe de Dumbéa, 22°23’S, 166°14’E, 23°19’S, 168°05’E, 305-367 m, 19 dd.

DISTRIBUTION. — Global distribution: northern Australia, New Caledonia, live in 330-1920 m, Philippines, live in 668-2050 m, western Indian Ocean (Scarabino 1995). Distribution in the New Caledonian region: throughout the region from the Chesterfield Plateau, all around New Caledonia, and the Norfolk and Loyalty Ridges, live in 330-1920 m.

REMARKS. — The holotype (dd) of Compressidentalium clathratum (ZMB 33.122, off Moreton Bay, Queensland, Australia, 550 fm [1006 m]) was examined for the first time during the present study and confirms the misidentification of Scarabino (1995: 259, figs 66, 70j). This mistake concerns all specimens from New Caledonia identified by Scarabino (1995) as Compressidentalium sedecimcostatum ; all are now identified as C. clathratum . Compressidentalium sedecimcostatum has a shiny surface and intercostal spaces finely striated throughout (Scarabino 1995). The ribs are smooth and the shell is considerably arched, both characters contrasting with C. clathratum . Therefore these are two distinct species, and I do not agree with Lamprell & Healy (1998), who treated C. sedecimcostatum as a junior synonym of C. clathratum .