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.