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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 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