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RISSOELLIDAE


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Rissoella micra (Finlay, 1924)

Description: Shell minute, globose, spire variable in height from height of aperture to almost equal to height of aperture. Protoconch of 1 whorls, coiled about same axis as teleoconch. Teleoconch up to 2 whorls; whorls strongly convex, smooth apart from indistinct growth lines. Aperture wide, outer lip thin and simple. Umbilicus open. Shell initially transparent mid-brown, becoming opaque with age.

Size: Up to 1.1 mm in length.

Distribution: Australia and New Zealand. In Australia, Forster, NSW, southwards to eastern Victoria and Tasmania.

Habitat: "On algae and beneath stones on mid to lower littoral and on algae in shallow sublittoral. Often abundant." (Ponder & Yoo, 1977)

Comparison: See R. secunda.

Synonymy: Notosetia fulva Laseron, 1950 is a previously recognised synonym.

Fig. 1: Fairlight, North Harbour, Sydney (C.355063).

 

Copyright Des Beechey 2016