Thyasira biplicata (Philippi, 1836)
Thyasiroidea : Thyasiridae
To size: To 8mm. Shell Structure: Thin. Equivalve: Equivalve. Equilateral: Equilateral. Tumidity: Tumid. Outline: Ovate-polygonal; anterior dorsal margin long, steeply sloping to narrowly rounded anterior margin; ventral margin a broad curve; posterior deeply sinuose with prominent posterior and marginal sinuses. Contour: Posterior sinus and sub-marginal sinus very pronounced, auricle very high and distinctly projecting above the dorsal margin. Lunule distinct.
Sculpture: Smooth except for incremental lines and growth stops. Margin: Inner margin smooth. Ligament: External but deeply sunken within auricle. Hinge: Hinge plate narrow, a weak flange like protuberance in RV. Pallial Musculature: Muscle scars obscure. Periostracum: Thin not persisting. Colour: Shell white. Additional Characters: 2 demibranchs.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Thyasiroidea : Thyasiridae
Listed are literature citing Thyasira biplicata (Philippi, 1836). Reference containing the species Type Description is highlighted.
Killeen I J & Oliver P G 2002. Thyasira polygona (Jeffreys) (Bivalvia: Lucinoidea), an abandoned taxon with a possible amphi Atlantic distribution. Journal of Conchology. 37: 383-390.
Oliver P G & Killeen I J 2002. The Thyasiridae (Mollusca: bivalvia) of the British continental shelf and North Sea Oilfields. Studies in Marine Biodiversity and Systematics from the National Museum of Wales. BIOMOR Reports. 3: 1-73.
Payne C.M. & Allen J.A. 1991. The morphology of deep-sea Thyasiridae (Mollusca: Bivalvia) from the Atlantic Ocean. Philosophical Transactions of the Royal Society of London Series B. 334: 481-566.
Philippi R A 1836. Enumeratio molluscorum Siciliae cum viventium tum in tellure tertiaria fossilium, quae in itinere suo observavit. Vol. 1 Schropp, Berlin. 267pp, 12pls.
Taylor J D, Williams S T & Glover E A 2007. Evolutionary relationships of the bivalve family Thyasiridae (Mollusca: Bivalvia), monophyly and superfamily status. Journal of the Marine Biological Association of the United Kingdom. 87: 565-574.
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