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Taxon profile

species

Rissoella rissoaformis A. W. B. Powell, 1939

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Allogastropoda »  family Rissoellidae »  genus Rissoella

Scientific synonyms

Zelaxitas rissoaformis Powell, 1939
Rissoella (Jeffreysiella) rissoaformis (Powell, 1939)
Zelaxitas fiordlandica C. A. Fleming, 1948

Images

Rissoella rissoaformis

Author: Powell, A.W.B.

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Description

Shell small, thin, vitreus, smooth, Rissoa-like, with tall spire, one and a third times height of aperture. Whorls 4,5, moderately convex. Sutures rather deeply impressed. Peristome thin and sharp, continued across parietal wall as a defined callus. Aperture ovate-pyriform. Operculum typical, ovate-pyriform, concentric with the nucleus median, near to the inner margin. Colour light brown, fading out on the lower part of the base.
Height, 2.55 mm.; diameter, 1.5 mm.
Holotype: In Auckland Museum.
Locality: Ocean Beach, Stewart Island (on seaweeds at low tide, A.W.B.P., Nov., 1934).
Powell, A.W.B. (1939). The Mollusca of Stewart Island.
Author: Jan Delsing

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