Polyschides cayrei, Scarabino, 2008

Scarabino, Victor, 2008, New species and new records of scaphopods from New Caledonia, Mémoires du Muséum national d'Histoire naturelle 196, pp. 215-268 : 250-253

Polyschides cayrei n. sp.

Figs 3f, 4c, 5e

TYPE MATERIAL. — Holotype (lv) MNHN 20106 and 8 paratypes (3 lv, 5 dd) MNHN 20107-20108 .

TYPE LOCALITY. — West coast of New Caledonia, Koumac, Chenal de la Passe de Koumac, 20°38.8’S, 164°15.6’E, 33-38 m [EXPÉDITION MONTROUZIER: stn 1313] .

MATERIAL EXAMINED. — New Caledonia proper. Koumac. 20°39.8’S, 164°15.3’E, 30-63 m, 14 dd (2 paratypes MNHN EXPÉDITION MONTROUZIER: stn 1313, Chenal de la Passe de 20108); Passe Deverd, stn 1321, 20°44.7’S, 164°14.9’E, 90- Koumac, 20°38.8’S, 164°15.6’E, 33-38 m, 6 lv, 14 dd (holotype 115 m, 2 dd; stn 1322, 20°45.2’S, 164°15.2’S, 53-71 m, 3 dd.

MNHN 20106 and 6 paratypes MNHN 20107); stn 1314,

DISTRIBUTION. — West coast of New Caledonia: Koumac and Passe Deverd, live in 33-38 m, shells down to 90 m.

DESCRIPTION. — Shell up to 12 mm long, translucent, with opaque irregular patches, some dead specimens white,

FIG. 3. a, Dischides belenae n. sp., holotype MNHN 20112 (5.1 mm), New Caledonia, EXPÉDITION MONTROUZIER stn 1345, apex and detail of surface. b, Dischides celeciai n. sp., holotype MNHN 20115 (7.4 mm), New Caledonia, BATHUS 4 stn DW 941, apex and detail of the surface. c, Dischides montrouzieri n. sp., holotype MNHN 20117 (8.4 mm), New Caledonia,EXPÉDITION MONTROUZIER stn 1255. d, Dischides dichelus ( Watson, 1879) , specimen (4 mm), New Caledonia, EXPÉDITION MONTROUZIER stn 1306. e, Polyschides wareni n. sp., holotype MNHN 20109 (8 mm), New Caledonia,EXPÉDITION MONTROUZIER stn 1257, shell and detail of apex. f, Polyschides cayrei n. sp., holotype MNHN 20106 (12 mm), New Caledonia, EXPÉDITION MONTROUZIER stn 1313. g, Cadulus deschampsi n. sp., holotype MNHN 20120 (5.7 mm), Norfolk Ridge, BATHUS 3 stn DW 824. h, Gadila vanuatuensis n. sp., holotype MNHN 20149 (13 mm), Vanuatu,MUSORSTOM 8 stn DW 1065. i, Cadulus rocroii n. sp., holotype MNHN 20137 (3 mm), East New Caledonia,BATHUS 1 stn 705. j, Cadulus lemniscoides n. sp., holotype MNHN 20128 (4.15 mm), shell and apex. k, Cadulus deverdensis n. sp., holotype MNHN 20123 (4.2 mm), New Caledonia, EXPÉDITION MONTROUZIER stn 1321. l, Cadulus loyaltyensis n. sp., holotype MNHN 20132 (2.53 mm), Loyalty Ridge, BATHUS 3 stn DW 790. m, Pulsellum stoliczkai n. sp., holotype MNHN 20102 (6 mm), New Caledonia,BATHUS 4 stn DW 883. n, Gadila lozoueti n. sp., holotype MNHN 20146 (3.6 mm), Norfolk Ridge, SMIB 8 stns DW 146-147, shell and detail of apex. o, Gadila hysteraulax n. sp., holotype MNHN 20143 (4.1 mm), New Caledonia, BATHUS 2 stn DW 754, detail of apex. p, Compressidens hienghenensis n. sp., holotype MNHN 20155 (5 mm), New Caledonia, BATHUS 1 stn DW 696, shell and detail of sculpture. q, Compressidens (?) caecum n. sp., holotype MNHN 20152 (3.9 mm), Norfolk Ridge, BIOCAL stn DW 44, shell and detail of apex.

sparse growth lines. Maximum diameter at anterior 1/3 of shell, tapering regularly to aperture. Apex small, circular, fragile, with 4 notches creating 4 lobes. Dorsal and ventral lobes wider than lateral ones. Preapical callus thin, lumen circular. Oral aperture slightly laterally compressed.

Measurements of holotype: L 12, W 1.7, mouth 1.2, w 0.5.

REMARKS. — The closest species to Polyschides cayrei is P. pelamidae (Chistikov, 1979) , but P. cayrei is less curved, has a more regular outline and the oral constriction is not so obvious. All specimens had the lobes broken, but their traces are clearly visible under a lens.

ETYMOLOGY. — Named after Patrice Cayré, formerly head of IRD’s Département des Ressources Vivantes, for his support of taxonomy and biodiversity explorations.