''Thracia convexa'' is a

bivalve Bivalvia () or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class (biology), class of aquatic animal, aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed b ...

mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Thraciidae Thraciidae is a family (biology), family of small marine (ocean), marine bivalves in the order (biology), superorder Anomalodesmata. Genera The following 16 genera are included in the family Thraciidae: References Further reading

* Arthur ...

Description

''Thracia convexa'' grows to about 6 centimetres (2.4 in) in length. The shell is inflated and brittle and the right valve is slightly larger and more convex than the left one. The outline is roughly triangular with the anterior end rounded and the posterior end somewhat elongated. The surface is sculptured with fine concentric lines and a slight ridge extends from the umbone to the margin of the valve on the posterior end. There are both external and internal ligaments joining the valves and there are no teeth on the hinge. On the inside of the valve, the posterior adductor muscle scar is large and triangular while the anterior one is long and thin. The pallial sinus is small. The valves gape at the posterior end where the two separate sinuses emerge. The colour of the valves is white both outside and inside and the

periostracum The periostracum ( ) is a thin, organic coating (or "skin") that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs, it is primarily seen in snails and clams, i.e. in gastropods an ...

, when present, is yellowish green.''Thracia convexa''
Marine Species Identification Portal. Retrieved 2011-12-09.

Distribution

''Thracia convexa'' is found in the north east Atlantic, its range extending from

Norway Norway, officially the Kingdom of Norway, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of the Kingdom of ...

to the

Mediterranean Sea The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern Eur ...

. It is distributed widely round the coasts of Britain where it burrows in sandy or muddy substrates, extending its siphons to the surface to breathe and feed.''Thracia convexa''

Marine Life Information Network The Marine Life Information Network (MarLIN) is an information system for marine biodiversity for Great Britain and Ireland. MarLIN was established in 1998 by the Marine Biological Association The Marine Biological Association of the United ...

. Retrieved 2011-12-09.

References

{{Taxonbar, from=Q3016590 Thraciidae Bivalves described in 1815 Taxa named by William Wood (zoologist)