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RISSOIDAE


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Rissoina (Rissoina) rhyllensis Gatliff & Gabriel, 1908

Description: Shell tall and slender, spire weakly convex. Protoconch relatively large, of 2 whorls, with distinct junction with teleoconch. Teleoconch of 5-6 almost straight-sided whorls. Axial sculpture usually absent, or present as irregular, weak axial folds; spiral sculpture ranging from completely absent to fine spiral grooves. Aperture lens or D-shaped, with broad anterior canal and narrow posterior canal; outer lip expanded, slightly thickened internally, greatly thickened externally; inner lip callused, thickened at top and bottom. Colour uniformly white or fawn, sometimes with continuous or interrupted brown band at middle of whorls.

Size: Up to 7.6 mm in length.

Distribution: Endemic to Australia; Sydney, NSW, southwards and around southern Australia to the Great Australian Bight, including Tasmania.

Habitat: Subtidal, in 7-183 m. Moderately common.

Comparison: See R. cretacea.

Synonymy: Rissoina fausta Hedley & May, 1908; Rissoina lintea Hedley & May, 1908

Fig. 1: Off Cape Pillar, Tasmania (C.163394)

 

Copyright Des Beechey 2010