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Pseudestea pyramidata (Hedley, 1903)

Description: Shell minute, spire straight in outline, twice height of aperture. Protoconch large, paucispiral, rounded, with spiral rows of minute pits, and distinct junction with teleoconch. Teleoconch up to 3 weakly rounded whorls, smooth or with faint spiral grooves and irregular axial growth lines. Aperture oval, with no anterior or posterior canals. Inner lip separated from last whorl by narrow groove. Outer lip smooth externally, without varix; smooth internally, without thickening. Umbilicus closed or open as a narrow slit. Colour mid-brown when fresh, fading to white with age.

Size: Up to 2.5 mm in length.

Distribution: Endemic to Australia: off Cape Moreton, Queensland, southwards to Bass Strait.

Habitat: Occurs of the continental shelf, 28-393 m. Moderately common.

Comparison: This species is similar in overall shape to some rissoids, but is characterised by the large protoconch and the groove between the inner lip and the previous whorl.

Synonymy: None.

Fig. 1:  Off Crookhaven, NSW, in 55-64 m (C.352012)


Copyright Des Beechey 2010