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Megastomia subcarina (Laseron, 1951)

Description: Shell medium size, up to 7 teleoconch whorls, last whorl half of total shell length, spire convex in outline. Protoconch coiled (Type B), of about 2 whorls, set on teleoconch with axis inclined at more than 90 to teleoconch. Teleoconch whorls smooth, rounded, last whorl weakly angled in immature shells. Aperture teardrop-shaped, length twice the width; columella with single moderately strong plait. Shell colourless transparent becoming opaque white with age.

Size: Up to 5 mm in length, usually less than 3 mm.

Distribution: Endemic to Australia: Yamba, NSW, southwards to Twofold Bay, NSW. Moderately common.

Habitat: A few specimens from beach washup but mainly subtidal, down to 183 m. Moderately common.

Fig. 1: Middle Harbour, Sydney. Dredged in 4 m (C.342570).


Copyright Des Beechey 2017