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species

Amphithalamus semen N. H. J. Odhner, 1924

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Littorinimorpha »  family Anabathridae »  genus Amphithalamus

Images

Amphithalamus semen

Author: Odhner, N.H.

Amphithalamus semen

Author: Ponder, W.F.

Taxon in country check-lists*

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Description

Shell minute, elongate-ovate, solid, imperforate, polished. Sculp¬ture varying from entirely smooth to showing traces of spiral striae; sometimes a pair of strong revolving keels in the periphery of the last whorl and an obscure one on the base. Colour fulvous, somewhat lighter on the aperture side; inner lip reddish orange. Pro-toconch finely spirally striated. Spire about 1 1/2 the height of the aperture. Suture shallow. Whorls 5, slightly convex, margined at the suture, the last one rounded in the periphery, flattened above and below. Aperture broadly ovate, fulvous within; peristome thick, continuous, double on account of a small swelling of the lip inside its edge, its colour white, except the reddish-orange columel-lar lip, which is sunk and sharply set off from the body whorl. Columella short, sinuous. Operculum ovate with a thicker disc on the inside, the margin of which forms a crest along the columellar edge of the operculum. Dimensions; H. 1.5, br. 0.7 mm. — Locality: North Island: 3, a few specimens.
Odhner, N.H., 1924; Papers from Dr. Th. Mortensen’s Pacific Expedition 1914–1916. XIX. New Zealand Mollusca.
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Amphithalamus semen (Odhner, 1924)]
Data retrieved on: 22 November 2013

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