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Anabathron pluteus (Laseron, 1950)

Description: Shell minute, solid, spire convex in outline. Protoconch paucispiral, rounded, punctate, with strong varix forming distinct junction with teleoconch. Teleoconch of about 1 rounded whorl, sculptured with about 3 spiral threads below suture, and similarly on base of last whorl. Aperture ovate, with no anterior or posterior canals. Inner lip of aperture separated from last whorl by wide sloping shelf, forming a false umbilicus (Fig. 2). Outer lip expanded, smooth and unthickened externally, smooth and thickened internally. Colour when fresh reddish-brown with last whorl and base white.

Size: Up to 1.1 mm in length.

Distribution: Endemic to Australia: Crowdy Head, NSW, southwards to Batemans Bay, NSW.

Habitat: Known from only 9 lots. Empty shells from beach washup and dredged within Sydney Harbour. Live specimens from algae washings from 16-25 m near Batemans Bay.

Comparison: This is similar in size to A. luteofuscus but wider, and the shelf forming a false umbilicus between inner lip and previous whorl is very pronounced.

Synonymy: None.

Fig. 1: Off Sow and Pigs Reef, Sydney Harbour (C.351202)

Fig. 2: Aperture of same specimen


Copyright Des Beechey 2010 Modified 2014