Species Account

Axinus grandis (Verrill & Smith 1885)

Thyasiroidea : Thyasiridae

Tebble name: n/a
Smith & Heppell name: Axinus grandis (Verrill, 1885)

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

Lower bathyal and abyssal settings but known from very few records in the Bay of Biscay and Rockall Trough. Chemosymbiotic, gills highly adapted for bacterial symbiosis.
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.

Depth Range
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)

Additional Information & Related Species


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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Record last modified: 17/05/2016