Frigidocardium valdentatum, Poutiers, 2006

Poutiers, Jean-Maurice, 2006, Two new species of protocardiine cockles (Mollusca, Bivalvia, Cardiidae) from the tropical Southwest Pacific, Zoosystema 28 (3), pp. 635-654 : 637-641

Frigidocardium valdentatum n. sp. ( Figs 1 -4)

TYPE MATERIAL. — Holotype: New Caledonia, LAGON, stn 190, off Baie de Saint Vincent, 22°02.1’S, 165°57.3’E, 135-150 m, 1 sh (MNHN).

Paratypes: same locality, 1 sh with rv broken, 1 lv (all MNHN). — Stn 830, E Lagoon, offPoindimié, 20°48.9’S, 165°19.3’E, 105-110 m, 4 lv, 4 rv (3 MNHN, 1 BMNH, 1 NMNZ, 1 NSMT, 1 USNM, 1 AMS).

BATHUS 4, stn DW 882, off Passe de Saint Vincent, external slope, 22°02’S, 165°56’E, 250-350 m, 1 rv (MNHN).

TYPE LOCALITY. — Southern New Caledonia, off Baie de Saint Vincent, NW Récif Tétembia, 22°02.1’S, 165°57.3’E, 135-150 m, LAGON 3, stn 190.

ETYMOLOGY. — The name refers to the strongly serrate mid-posterior margin. It is derived from the Latin valde = strong, and dentatum = dentate.

OTHER MATERIAL EXAMINED. — New Caledonia. VAU- BAN 1978-1979, stn DR 33, S Lagoon, off Passes de Boulari, external slope, 22°33’S, 166°25’E, 290-350 m, 1 lv. — Stn DR 40, S Lagoon, off Passes de Boulari, external slope,, 22°30’S, 166°24’E, 250-350 m, 1 lv, 1 rv.

LAGON, stn 496, N Lagoon, northern external slope, 19°03.6’S, 163°10.3’E, 200-215 m, 1 lv, 1 rv. — Stn 858, E Lagoon, Grand Récif Mangalia, 20°37.3’S, 165°07.4’E, 220 m, 1 lv.

MUSORSTOM 6, stn DW 485, NE slope of Loyalty Islands, 21°23.48’S, 167°59.33’E, 350 m, 1 lv.

BATHUS 1, stn DW 678, off Passe de Touho, external slope, 20°49’S, 165°19’E, 94-100 m, 1 lv, 2 rv. — Stn DW 685, off Passe de Hienghu, 20°35’S, 165°07’E,

244 m, 1 lv. — Stn DW 691, off Passe de Hienghu,

Poutiers J.-M.

left valve; B, exterior and interior of right valve; C, dorsal view; D, posterior view.

New Protocardiinae (Mollusca, Bivalvia) from Southwest Pacific

FIG. 2. — Frigidocardium valdentatum n. sp., paratype, length 14.5 mm, New Caledonia, LAGON, stn 190: A, exterior and interior of left valve ; B, posterior view; C, detail of dorsal view (SEM); D, sculpture of posterior slope of left valve (SEM). Scale bars: 1 mm.

20°35’S, 164°59’E, 227-250 m, 1 lv, 6 rv. — Stn CP 701, off Passe de Baye, 20°58’S, 165°36’E, 302-335 m, 1 lv. — Stn CP 712, off Passe de Ngoé, 21°44’S, 166°35’E, 210 m, 2 rv.

BATHUS 4, stn DW 894, Grand Passage, 20°16’S, 163°52’E, 245-268 m, 1 sh, 1 lv. — Stn CP 897, Grand Passage, 20°16’S, 163°52’E, 305-350 m, 1 lv. — Stn DW 933, N Lagoon, northern external slope, 19°07’S, 163°29’E, 212-220 m, 1 rv.

Expédition MONTROUZIER, stn 1321, Koumac area, Passe Deverd, 20°44.7’S, 164°14.9’E, 90-115 m, muddy sand, 7 lv, 6 rv. — Stn 1323, Passe de Koumac, 20°40.9’S, 164°14.8’E, 82-120 m, shelly muddy sand, 3 lv.

Atelier LIFOU 2000, stn DW 1650, Baie du Santal, SW of Récif Shelter, 20°54.15’S, 167°01.7’E, 120-250 m, 2 lv.

NORFOLK 1, stn CP 716, Norfolk Ridge, northern slope of Artigonia Mount, 23°22’S, 168°03’E, 266-276 m, 1 lv (broken).

Vanuatu. MUSORSTOM 8, stn DW 1066, W Malekula

Island, 16°16’S, 167°21’E, 349-386 m, 1 lv. — Stn CP 1131, S Santo Island, 15°38’S, 167°04’E, 140-175 m, 1 rv. — Stn CP 1135, S Santo Island, 15°40’S, 167°02’E, 282-375 m, 1 lv.

Fiji. MUSORSTOM 10, stn DW 1333, Bligh Water, 16°50.4’S, 178°12.4’E, 200-215 m, 4 lv, 4 rv. — Stn DW 1334, Bligh Water, 16°51.4’S, 178°13.9’E, 251-257 m, 2 lv, 4 rv. — Stn CP 1363, S of Viti Levu, 18°12.4’S, 178°33.0’E, 144-150 m, 4 lv, 5 rv. — Stn CP 1366, S of Viti Levu, 18°12.4’S, 178°33.1’E, 149-168 m, 2 lv, 3 rv. — Stn CP 1370, S of Viti Levu, 18°12.3’S, 178°33.1’E, 113-123 m, 1 lv. — Stn CP 1371, S of Viti Levu, 18°12.4’S, 178°32.8’E, 135-151 m, 3 lv, 6 rv. — Stn CP 1387, near Beqa Channel, 18°18.5’S, 178°04.7’E, 229-370 m, 1 lv. — Stn CP 1389, near Beqa Channel, 18°18.6’S, 178°04.7’E, 241-417 m, 2 lv, 1 rv. — Stn CP 1390, near Beqa Channel, 18°18.6’S, 178°05.1’E, 234-361 m, 2 lv, 1 rv.

BORDAU 1, stn CP 1394, Somosomo Strait, 16°45’S, 179°59’E, 416 m, 4 lv, 8 rv. — Stn DW 1440, Vanua

Balava, 17°11’S, 178°43’W, 190-308 m, 1 lv. — Stn CP

Poutiers J.-M.

FIG. 3. — Frigidocardium valdentatum n. sp., paratype, length 21.3 mm, sculpture of left valve, New Caledonia, LAGON, stn 830: A, exterior ; B, dorsal view; C, detail of posterior slope; D, detail of anterior slope; E, detail of ventral margin. Scale bars: 2 mm.

1448, Somosomo Strait, 16°45’S, 179°59’E, 410-500 m, 1 lv. — Stn DW 1451, Somosomo Strait, 16°45’S, 179°59’E, 400-460 m, 2 lv.

Tonga. BORDAU 2, stn DW 1510, NW of Tongatapu, 21°05’S, 175°23’W, 461-497 m, 1 rv. — Stn CP 1567, NW of Tongatapu, 21°02’S, 175°19’W, 351-356 m, 1 rv. — Stn CP 1568, NW of Tongatapu, 21°02.07’S, 175°18.62’W, 431 m, 1 lv.

DISTRIBUTION. — West Pacific, from off New Caledonia to Fiji and Tonga islands, north to Vanuatu and south to northern Norfolk Ridge, in 82- 460 m.

New Protocardiinae (Mollusca, Bivalvia) from Southwest Pacific

TABLE 1. — Selected measurements (in mm) and length/height ratio of Frigidocardium valdentatum n. sp. Abbreviations: lv, left valve; rv, right valve; sv, single valve.

DESCRIPTION

Shell equivalve, large-sized for the genus (up to 27.5 mm in height), inflated, slightly higher than long (length/height ratio 0.92 to 0.98), roundedsubquadrate and somewhat asymmetrical in outline, rather thin but solid. Umbones prosogyrate, prominent, situated in front of mid-length of valves. Anterodorsal margin widely convex, decidedly slanted forward.Anterior margin regularly rounded, joining without discontinuity the distinctly convex ventral margin, giving a semicircular outline to the anterior half of shell. Posterior margin truncate and straightish, higher than the anterior margin, forming a rounded angle with both posterodorsal and ventral margins. Posterodorsal margin elongate, feebly convex, becoming rounder posteriorly.

Figures

FIG. 1. — Frigidocardium valdentatum n. sp., holotype, length 23.6 mm, New Caledonia, LAGON, stn 190: A, exterior and interior of