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Turbonilla gravicosta (Laseron, 1951)

Description: Shell medium size, spire convex in outline, up to 9 teleoconch whorls. Protoconch coiled (Type B), of about 2 whorls, set on teleoconch with axis inclined at about 110 to teleoconch axis. Whorls slightly rounded, sculptured with about 16 strong axial folds, on last whorl terminating level with top of aperture; fine spirals between axials, continuing onto base as uninterrupted spirals. Aperture teardrop-shaped, columella without plaits. Shell translucent white becoming opaque with age.

Size: Up to 4 mm in length.

Distribution: Endemic to Australia: Iluka, NSW, southwards to Sydney, NSW.

Habitat: Known from beach washup and subtidal to 27 m. Uncommon.

Fig. 1: Little Coogee Bay, Sydney, NSW (C.342858).


Copyright Des Beechey 2016