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4942-1.jpg (88086 bytes)


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Amphithalamus pyramis (Laseron, 1950)

Description: Shell minute, solid, spire weakly convex in outline. Protoconch paucispiral, rounded, with spiral rows of minute pits, and distinct junction with teleoconch. Teleoconch whorls weakly rounded, without axial or spiral sculpture; last whorl weakly angled or with low, wide cord at periphery on ventral side, fading out on last quarter whorl. Aperture ovate, with no anterior or posterior canals. Inner lip of aperture separated from previous whorl by wide channel, with a callus plug at suture. Outer lip without varix externally, thickened but smooth internally. Umbilicus closed. Colour white, amber or yellowish-brown.

Size: Up to 2.0 mm in length.

Distribution: Endemic to Australia: Stradbroke Island, Queensland, southwards to Bass Strait.

Habitat: Empty shells are common in beach washup and down to 113 m. Living specimens are known from algae and rock washings, from the low intertidal down to 45 m.

Comparison: See A. incidatus.

Synonymy: None.

Fig. 1: Manly Beach, Sydney, NSW (C.216444)

Fig. 2: Off North Head, Sydney, NSW, 20 m depth (C.216448)


Copyright Des Beechey 2010