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ORBITESTELLIDAE


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Orbitestella decorata Laseron, 1954

Description: Shell minute, spire flat or slightly sunken. Protoconch of about 1 whorls with irregular radial lines and spiral threads, first whorl sloping downwards. Dorsal surface of teleoconch whorls with a strongly nodulose, broad spiral cord on inside of spiral, surrounded on the outside by a shallow groove before the strongly nodulose upper peripheral cord. Periphery with a deep groove between upper and lower peripheral cords. Base with widely open umbilicus, surrounded by a broad spiral cord as on dorsal surface. Shell transparent becoming opaque white with age.

Size: Up to 0.8 mm in diameter.

Distribution: Endemic to Australia: Port Stephens, NSW, southwards to Malacoota, Vic.

Habitat: Specimens are from rock and algal washings from the intertidal down to 18 m, and from beach washup. Uncommon.

Comparison: See O. bastowi.

Remarks: The shell and anatomy of this species were described in detail by Ponder (1990).

Figs. 13:  Jervis Bay, NSW (C.355528).

 

Copyright Des Beechey 2016