Thracia convexa (W Wood, 1815)
Thracioidea : Thraciidae
To size: To 70mm. Shell Structure: Thin, brittle. Equivalve: Almost equivalve, right valve slightly larger than left. Equilateral: Inequilateral, beaks posteriorly orthogyrate. Beak of LV sits in hole in RV. Outline: Subtrigonal, posterior dorsal margin convex to a narrowly rounded posterior margin. Ventral margin almost straight, leading to a narrowly rounded anterior margin. Anterior dorsal margin is convex but rises higher than posterior. umbonal region very tumid. Contour: Ridge runs from dorsal to ventral margin posteriorly.
Sculpture: Concentric lines very close together on most of the shell but are fewer on posterior region. Margin: Smooth. Ligament: External and internal; external short dark brown arch behind beaks, internal on a short resilifer. Hinge: Lithodesma short, thin and often lost. Pallial Musculature: Pallial sinus shallow, around a third the length of shell. Not confluent. Periostracum: Pale brown/beige. Colour: White.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Thracioidea : Thraciidae
Listed are literature citing Thracia convexa (W Wood, 1815). Reference containing the species Type Description is highlighted.
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.
Wood W 1815. General conchology or a description of shells, arranged according to the Linnean system, London p. 92, pl 18 Fig 1.
- Conchological Society
of Great Britain & Ireland
Provides resources for understanding, identifying, recording, and conserving molluscs
Check List of European Marine Mollusca
The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment.
- NBN Gateway
National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers.
- Malacological Society
- Unitas Malacologica
- Census of Marine Life
MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.