Species Account

Thracia phaseolina (Lamarck, 1818)

Thracioidea : Thraciidae

Tebble name: Thracia phaseolina (Lamarck)
Smith & Heppell name: Thracia phaseolina (Lamarck, 1818)

To size: To 40mm. Shell Structure: Brittle. Equivalve: Inequivalve, RV more convex than LV. Equilateral: Inequilateral, beaks behind midline. Outline: Oval, anterior part longer and higher than posterior and is flared, broadly curving to the ventral margin, which is slightly curved. Posterior is rostrate, truncate.

Sculpture: Concentric lines and ridges covered with fine granulations which are more visible on the posterior and can only be seen at higher magnification. Shell feels smooth except posterior part. Margin: Smooth. Ligament: External and internal: External short, behind beaks; internal thick in a narrow triangular resilifer below external. Hinge: Lithodesma short (deeper than villosiuscula ) in front of ligament but frequently lost. Pallial Musculature: Rounded to below anterior end of resilifer. Not confluent. Periostracum: Light brown to yellow, very thin. Colour: White.

Distribution & Ecology

Widely distributed from low in the intertidal across the entire shelf. Inhabits sand, muddy sand and muddy gravels. Many records may actually be T. gracilis.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species


Listed are literature citing Thracia phaseolina (Lamarck, 1818). Reference containing the species Type Description is highlighted.

Lamarck J B P A de M 1818. Histoire naturelle des Animaux sans vertèbres 5. Paris. 612pp.
Soot-Ryen T 1941. Northern Pelecypods in the collection of Tromsø Museum I Order Anomalodesmacea Families Pholoadomyidae. Thraciidae and Periplomatidae. Tromsø Museums Arshefter Naturhistorisk Avd. Nr. 17. 61: 1-41, 10 pls.


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Record last modified: 22/03/2016