Thyasira succisa (Jeffreys, 1876)
Thyasiroidea : Thyasiridae
To size: To 3.5mm. Shell Structure: Thin but solid. Equivalve: Slightly inequilateral, LV a little larger. Equilateral: Inequilateral, beaks distinctly to the posterior. Tumidity: Moderate. Outline: Subovate, expanded anterio-ventrally; anterior dorsal (lunule margin straight, sloping to broadly rounded anterior margin this curving continuously with ventral margin; posterior angulate, posterior ventral margin distinct obliquely truncate; posterior dorsal margin long, sloping steeply, auricle projecting. Contour: Lunule narrow, slightly sunken, demarcated by low ridges. Posterior area flattened, posterior ridge low; Submarginal sulcus long, narrow; auricle short but visible above edge of submarginal sulcus.
Sculpture: Surface a little glossy, sculpture of faint concentric lines and growth stops. Margin: Smooth. Ligament: External, deeply sunken in auricle. Hinge: Hinge plate relatively strong; prominent cardinal boss in RV, corresponding depression in LV. Inner margin of submarginal sulcus of RV with elongate (pseudo-lateral tooth) groove. Pallial Musculature: Muscle scars obscure. Periostracum: Obscure. Colour: Shell white. Additional Characters: 2 demibranchs.
Distribution & Ecology
In mud and muddy sands, ecology not known.
Anatomy - Payne & Allen, 1991
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Thyasiroidea : Thyasiridae
Listed are literature citing Thyasira succisa (Jeffreys, 1876). Reference containing the species Type Description is highlighted.
Jeffreys J G 1876. New and peculiar Mollusca of the Kellia, Cyprina and Corbula families, procured in the Valorous expedition. Annals and magazine of natural History. (4) 18: 490-499.
Olabarria C. 2005. Patterns of bathymetric zonation of bivalves in the Porcupine Sea Bight and adjacent abyssal plain, NE Atlantic. Deep-Sea Research I. 52: 15-31.
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.
- Conchological Society
of Great Britain & Ireland
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