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Agatha australis Angas, 1871

Description: Shell large for family, wide, up to 8 whorls, spire weakly convex in outline, last whorl more than half of shell length. Protoconch coiled (Type B), of about 2 whorls, set on teleoconch with axis inclined at about 110 to teleoconch, so that nucleus is submerged. Teleoconch whorls rounded, stepped at suture, smooth. Aperture teardrop-shaped, length twice the width; columella with single strong plait. Shell opaque white.

Size: Up to 10 mm in length.

Distribution: Endemic to Australia. The confirmed range is from Clarence River, NSW, southward to Twofold Bay, NSW. There are a few specimens from SA and south-western WA which are probably this species but the identification needs to be confirmed. Uncommon.

Habitat: In NSW, empty shells are known from beach washup and down to 15 m.

Comparison: See A. angusta.

Fig. 1:  Botany Bay, NSW (C.340047).


Copyright Des Beechey 2016