Serrata bathusi, Boyer, 2008

Boyer, Franck, 2008, The genus Serrata Jousseaume, 1875 (Caenogastropoda: Marginellidae) in New Caledonia, Mémoires du Muséum national d'Histoire naturelle 196, pp. 389-436 : 396-398

Serrata bathusi n. sp.

Fig. 8

TYPE MATERIAL. — Holotype (dd) MNHN 20584 and 2 paratypes (dd) MNHN 20585 .

TYPE LOCALITY. — Antigonia Bank, Norfolk Ridge , 23°21’S, 168°02’E, 386-390 m [BATHUS 3: stn DW 829] .

MATERIAL EXAMINED. — Southern New Caledonia. BATHUS 2: stn DW 717, 22°44’S, 167°17’E, 350-393 m, 1 dd .

Norfolk Ridge. BATHUS 3: stn DW 829, 23°21’S, 168°02’E, 386-390 m, 3 dd (holotype, Fig. 8 and paratypes).

DISTRIBUTION. — Southern New Caledonia and northern Norfolk Ridge, shells in 386-390 m.

DESCRIPTION. — Shell ovate fusiform, solid, opaque. Protoconch paucispiral, wide, bulging, smooth. Spire high, triangular, blunt, whorls weakly convex. Aperture very oblique, moderately narrowed, widening slightly towards base. Base slightly attenuated. Central part of outer lip straight, upper area thickened externally, lower part very narrow, shoulder

FIGS 1-16. 1, Serrata serrata (Gaskoin, 1849) , holotype BMNH 1992109, H 7.93 mm. 2, Serrata mustelina (Angas, 1871) , paratype BMNH, H 5.80 mm. 3, Serrata fasciata (Sowerby, 1846) , Kaiatea, New Zealand, FBC, H 7.80 mm. 4, Serrata translata (Redfield, 1870) , Makemo, Tuamotu, FBC, H 4.20 mm. 5, Serrata boucheti ( Boyer,2001) , holotype MNHN 20751, Norfolk Ridge, SMIB 8 stn DW 167, H 5.15 mm. 6, Serrata minima n. sp., holotype MNHN 20580, Norfolk Ridge, SMIB 8 stn DW 90, H 3.90 mm. 7, Serrata ovata n. sp., holotype MNHN 20582, Norfolk Ridge, NORFOLK 1 stn DW 1724, H 4.30 mm. 8, Serrata bathusi n. sp., holotype MNHN 20584, Norfolk Ridge, BATHUS 3 stn DW 829, H 4.15 mm. 9, Serrata summa n. sp., holotype MNHN 20586, Norfolk Ridge,NORFOLK 1 stn DW 1723, H 4.40 mm. 10, 11, Serrata quadrifasciata n. sp., 10, holotype MNHN 20587, southern New Caledonia,BATHUS 2 stn DW 717, H 5.15 mm; 11, paratype MNHN 20588,same data, H 5.80 mm. 12, Serrata pupoides n. sp., holotype MNHN 20589, Norfolk Ridge,BATHUS 3 stn CH 801, H 4.85 mm. 13, 14, Serrata occidentalis n. sp.; 13, holotype MNHN 20591,southern New Caledonia, BATHUS 2 stn DW 739, H 4.80 mm; 14, paratype MNHN 20592, same data, H 4.15 mm. 15, Serrata orientalis n. sp., holotype MNHN 20593, southern New Caledonia, BIOCAL stn DW 77, H 5.10 mm. 16, Serrata veneria n. sp., holotype MNHN 20595, southern New Caledonia, BIOCAL stn DW 46, H 4.05 mm.

sloping, central part of outer edge hunched, lower part straight and oblique, outer margin thickened, slightly bevelled, weakly stepped, inner lip straight, subvertical, bearing 9 small denticles, similar in size to the interspaces, larger denticle bordering siphonal canal, 3 lowest denticles separated by wide intervals. Four thin columellar plaits, 2 lower ones sinuous, oblique, upper one smaller, less oblique.

Ground colour whitish (faded), with 2 orange marks on upper part of outer margin and 2 more on lower part.

Dimensions: 4.15 x 1.95 mm.

Radula unknown.

REMARKS. — In many respects, Serrata bathusi is very similar to S. minima . Serrata bathusi differs mainly in its simpler and less oblique columellar plaits, its somewhat wider aperture, its higher spire and its more protruding upper labrum than those of S. minima . Serrata bathusi is sympatric with S. minima on the Antigonia Bank but an isolated shell was also collected quite a long distance to the north, off the Norfolk Ridge.

ETYMOLOGY. — From the Expedition BATHUS 3 (1993), during which the type material of the species was collected.