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Fluxinella trochiformis (Schepman, 1909)

Description: Shell wider than high, spire outline straight. Protoconch of one smooth whorl, with well-defined junction with teleoconch. Teleoconch up to 5 whorls, whorls shouldered at top and concave below. Last whorl sharply keeled; base rounded beside concave or flat keel. Surface smooth apart from faint growth lines, and sometimes a few spiral grooves beside keel on base. Umbilicus wide, deep, with sharply angled entry, often with spiral cord at angle. Aperture with inner and outer lips thin, with deep sinus at top of outer lip and another towards outer edge of base, but usually broken.. Colour white, polished.

Size: Up to 7.2 mm wide, 3.5 mm high.

Distribution: The Australian Museum holds specimens from: Timor Sea; eastern Australia from Capricorn Channel, Queensland, southwards to Wollongong, NSW; Tasmania; South Australia. The type locality is Ceram Sea, Indonesia.

Habitat: Taken from 320 - 1200 m. Very uncommon.

Remarks: Garrard (1977) included this species in the Architectonicidae in his review of that family, but it was recognised as belonging in Seguenziidae after Marshall (1983) erected the genus Fluxinella and described similar species from New Zealand.

Figs. 1,2,3: 4783, 4784, 4785 Off Wollongong, NSW, 1200 m (C.210041)


Copyright Des Beechey 2009