Species Account

Thyasira scotiae Oliver & Drewery, 2014

Thyasiroidea : Thyasiridae

Tebble name: n/a
Smith & Heppell name: n/a

To size: To 20mm. Shell Structure: Rather thin, fragile, transluscent. Equivalve: Equivalve. Equilateral: Equilateral. Tumidity: Rather tumid. Outline: Subcircular, height and length more or less equal, umbos prosogyrate, lunule margin concave, relatively short; posterior margin weakly bisinuate; ventral and anterior broadly rounded. Posterior dorsal area weakly bisulcate; submarginal sulcus shallow demarcating a long low auricle; posterior sulcus shallow. Lunule distinct as a smooth area defined by change in sculpture but lacking any defining ridge or groove.

Sculpture: Of weak undulations, fine commarginal lines and occasional raised threads especially over posterior and anterior areas. Margin: Inner margin smooth. Ligament: Ligament deeply sunken not rising above the shell margin; relatively short "ligament/MaxD" = 0.30. Hinge: Lacking teeth. Pallial Musculature: Muscle scars indistinct, hardly visible in most shells; anterior adductor scar elongate separated from the pallial line for over half its length. Periostracum: Very thin, transparent. Colour: Shell off white.

Distribution & Ecology

Known only from a single location in the Hatton-Rockall Basin. Thyasira scotiae is chemosymbiotic and associated with cold seep settings. Thyasira scotiae uniquely hosts the equiline polychaete Antonbrunnia.

Depth Range
Bathyal (500 - 2000m)

Additional Information & Related Species

Juvenile Description

Juveniles were not found.

Key Features & Similar Species

Thyasira scotiae is one of the larger species of Thyasira associated with cold seeps and most resembles T. sarsi. Anatomical differences are more distinct than those of the shell, which in T. scotiae is rather more inflated with a more slender and shorter ligament. Thyasira sarsi is not known from bathyal depths. Thyasira scotiae uniquely hosts the equiline polychaete Antonbrunnia.

Related Species


Listed are literature citing Thyasira scotiae Oliver & Drewery, 2014. Reference containing the species Type Description is highlighted.

Oliver P.G. & Drewery J. 2014. New species of chemisymbiotic clams (Bivalvia: Vesicomyidae and Thyasiridae) from a putative ‘seep’ in the Hatton-Rockall Basin, north-east Atlantic.. Journal of the Marine Biological Association of the United Kingdom. 94 (2): 389-403.


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Record last modified: 17/05/2016