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Taxon profile

species

Thyasira barbarensis (Dall, 1890)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Bivalvia - bivalves »  order Lucinida »  family Thyasiridae »  genus Thyasira

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Description

Shell white, superficially chalky, rather compressed, rounded below, the beaks not very prominent; the surface is sculptured only with incremental lines; there is a rather large impressed lunular area not circumscribed by a line; behind there is an upper, narrow and deep radial depression with a lower, wider and less marked second one, which make corresponding flexuosities of the posterior margin; a narrow rather deep groove runs near the margin outside the ligament marking off a narrow elongated escutcheon; interior white, unpolished; hinge edentulous. Maximum longitude of shell 17; altitude 17; diameter 10mm.
Dall, W.H. 1990. Scientific results of explorations by the U. S. Fish Commission Steamer “Albatross”. No. VII. Preliminary report on the collection of Mollusca and Brachiopoda obtained in 1887–88.

Interchangeable taxa

This fine species is nearer T. sarsii than any other, but has decidedly more elevated and narrower beaks. It is probable that all these shells should be called Axinus, as there can be little doubt that his fossil type really belongs to this group. As long as even that little exists, however, it is a question whether Sowerby's name should be adopted.
Dall, W.H. 1990. Scientific results of explorations by the U. S. Fish Commission Steamer “Albatross”. No. VII. Preliminary report on the collection of Mollusca and Brachiopoda obtained in 1887–88.

Distribution

USA. Santa Barbara Islands, California.
Author: Jan Delsing

Similar species

Thyasira sarsi R. A. Philippi, 1845

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Thyasira barbarensis (Dall, 1890)]
Data retrieved on: 23 November 2013

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