Claviscala nodulosa

Description:

Dimensions range from 30 mm - 35.5 mm high and 8.3 mm - 9.4 mm wide.
Width to height ratio: 0.28:1 ~ 0.26:1

Shell: elongate turreted; moderately thin, glossy; moderately small. Exterior colour yellowish brown. About 14.5 whorls, convex, tightly coiled; protoconch with ~1.5 whorls convex, small, polished, smooth, white; generally eroded in matured specimens; teleoconch tightly coiledwith 10-13 whorls convex. Spire elevated. Suture simple and moderately deep. Imperforate. Approximately 28 costae on the body whorl. Costae are strong. Intercostal spaces weak spiral striae which crossed over the costae forming weak nodes where they intersect. Interstices with approximately 10 spiral striae per whorl. Base with basal disc keeled at the periphery. Columella lip slightly thickened, recurved in shape. Aperture ovate; outer lip thin.

This species is close to Claviscala turrita, but differs by its weakly nodulated sculpture on the surface and having more axial ribs. It is similar to Amaea (Narvaliscala) percancellata, but differs by having a rather thin shell and not having a distinct lip.

Distribution:

Off Kii Peninsula, Japan

Habitat:

300-500 m

Etymology:

[latin] from nodulus = small lump or nodule, in reference to the shell's sculpture

Type Material:

Holotype (NSMT Mo-71413) height 30.3 mm; breadth 8.5 mm (Figs. 13, 14). Paratype I (NSMT Mo-71414) height 35.3 mm; breadth 9.4 mm. Paratype 2 (Koyama collection) height 30.0 mm; breadth 8.3 mm. for Claviscala nodulosa Nakayama, 2000 - Locality: Off Kii Uragami, Kii Peninsula, at about 380 m deep.. [Nakayama, T., 2000]
Holotype: NSMT Mo- 71413 for Claviscala nodulosa Nakayama, 2000 - Locality: off Kii Uragami, Kii Peninsula, Japan, at about 380 m.. [Brown, L. & Neville, B.D., 2015]