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Taxon profile

species

Thyasira subovata (Jeffreys, 1881)

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

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Thyasira subovata

Author: Scaperrotta et al.

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Description

Habitat: it lives in the deep circalittoral zone, on slimy bottoms.
Distribution: it is known in a large part of the Mediterranean, where it is rather rare.
Notes: shell brittle, small in sizes, equivalve, inequilateral, oval in outline, valves convex, surface either smooth or with a few fine growth striae. Sometimes it is covered by ferrugineous deposits. One very weak fold corresponds with a slight angularity in the posterior part, while anteriorly it is roundish. Ventral zone roundish but a little bit flattened, antero-dorsal margin prominent. Umbo placed posteriorly, not much protuberant. Lunule extended but not much defined. Ligament, just visible externally, placed not far from posterior margin. Outline of juvenile specimens not very different from the adults one. This species, among its similar ones living in the Mediterranean, can be mistaken with T oblonga. However this one has a different outline due to one subacute angle in the posterior part and to a fine denticulation on the dorsal margins. Payne & Allen (1991) describe a subspecies minuta in the Atlantic depths, in front of Angola and Namibia coasts. The average measures are around 1.5 mm in width.
Scaperrotta, M. ,Bartolini, S. & Bogi, C., 2009. Accrescimenti, Vol. 2. Stages of growth of marine molluscs of the Mediterranean Sea. (secondary description)
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 Thyasira subovata Jeffreys, 1881]
Data retrieved on: 23 November 2013

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