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Colpospira wollumbi Garrard, 1972

Description: Protoconch of 1 whorls, teleoconch up to 11 whorls in adult shells. Whorls convex, suture impressed. Whorls spirally ribbed, latter whorls with 4 equally spaced keels or ribs, the middle two often stronger. Axial sculpture of sparse growth lines conforming to shape of outer lip sinus. Inner lip of aperture reflected outwards at base; outer lip thin, with a deep sinus, lip usually broken Base convex with 5-7 threads. Colour white with upper half of whorls and centre of base fawn in fresh shells. Operculum circular, corneous.

Size: Up to 6.5 mm in length.

Distribution: Endemic to Australia; Cape Moreton, Queensland, around southern Australia to south-western WA.

Habitat: Known from 9-393 m, but most commonly in 50-150 m. Common.

Comparison: Distinguished by its small size, four spiral ribs on convex whorls, and colour pattern in fresh specimens. C. yarramundi is similar, but has two strong keels on the periphery and a weaker keel below and is uniformly white.

Fig. 1: 70 miles south of Lakes Entrance, Bass Strait, in 95 m (C.381071).

 

Copyright Des Beechey 2006