Thracia papyracea (Poli, 1791)Thracioidea : Thraciidae
Inequivalve, RV more convex than LV.
Inequilateral, beaks behind midline.
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.
Continental Shelf (to 200m)
Juveniles & Similar Species
Key Features & Similar Species
Listed are literature citing Thracia papyracea (Poli, 1791). Reference containing the species Type Description is highlighted.
Poli J X 1791. Testacea Utriusque Siciliae eorumque historia et anatome. Vol.1 Parma, Regio Typographeio. 1-74, pls 1-18.
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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