Axinus grandis (Verrill & Smith 1885)
Thyasiroidea : Thyasiridae
To size: To 25mm. Shell Structure: Very fragile. Equivalve: Equivalve. Equilateral: Equilateral. Tumidity: Moderately inflated. Outline: Quadrate, posterior dorsal margin straight sloping to truncate posterior margin; ventral margin straight or curved, junction with anterior margin narrowly rounded; anterior expanded, margin almost straight; anterior dorsal margin excavated. Contour: Posterior with a shallow sinus, median area flattened, lunule area distinct.
Sculpture: Surface irregularly undulating with prominent raised concentric lines and growth stops. Margin: Inner margin smooth. Ligament: External but sunken in a short resilifer. Hinge: Hinge plate narrow, lacking distinct teeth. Pallial Musculature: Muscle scars obscure. Periostracum: Thin, yellowish if preserved. Colour: Shell white. Additional Characters: 2 demibranchs.
Distribution & Ecology
Of very sporadic occurrence in lower bathyal and abyssal settings, may be associated with seeps.
Gross anatomy – Payne & Allen, 1991.
For related species – Oliver & Holmes, 2007.
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Additional Information & Related Species
Thyasiroidea : Thyasiridae
Listed are literature citing Axinus grandis (Verrill & Smith 1885). Reference containing the species Type Description is highlighted.
LÖFFLER S, JANSSEN s r, GÜRS k r & TAVIANI m 2005. The genus Axinus Sowerby, 1821 in the Mediterranean basin (Bivalvia: Thyasiridae). Journal of Conchology. 38: 581.
Oliver P G & Holmes A M 2007. A new species of Axinus (Bivalvia: Thyasiroidea) from the Baby Bare Seamount, Cascadia Basin, NE Pacific with a description of the anatomy. Journal of Conchology. 39: 363-376.
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.
Verrill A E 1885. Third catalogue of Mollusca recently added to the fauna of thte New England Coast and the adjacent parts of the Atlantic, consisting mostly of deep-sea species, with notes on others previously recorded. Transactions of the Connecticut Academy of Arts and Sciences. 6: 395-452, pls 42-45.
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