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''Petricolaria pholadiformis'',
common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often contrast ...
s false angelwing, or false angel wing (US), and American piddock (UK), is a species of saltwater clam, a
marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...
bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...
mollusk in the family Veneridae, the Venus clams.


Description

''Petricolaria pholadiformis'' closely resembles the angel wing (''
Cyrtopleura costata ''Cyrtopleura costata'', or the angel wing clam, is a bivalve mollusc in the family Pholadidae. It is found in shallow parts of the northwest Atlantic and also in the North Sea of Scotland coastline and west coast of the Adriatic Sea by a remote ...
''), the main distinguishing feature being that it lacks the apophyses, the spoon-shaped wings located near the beak, of the real angel wing. It grows to about long and is usually white. The anterior end is extended and has a rounded point while the posterior end is blunt and curved. There are ridges radiating from the beak, which are more pronounced at the posterior end, and fainter growth rings running parallel with the margin.False Angel Wing: A Piddock for Your Thoughts
Retrieved 2011-11-30.
Right and left valve of the same specimen: File:Petricolaria pholadiformis 01.jpg, Right valve File:Petricolaria pholadiformis 02.jpg, Left valve


Taxonomy

''Petricolaria pholadiformis'' was formerly classified under genus ''
Petricola ''Petricola'' is a genus of saltwater clams, marine bivalve molluscs in the subfamily Petricolinae of the family Veneridae, the Venus clams.MolluscaBase eds. (2021). MolluscaBase. Petricola Lamarck, 1801. Accessed through: World Register of Mari ...
'' as ''Petricola pholadiformis'' but has since been reclassified under genus ''
Petricolaria ''Petricolaria'' is a genus of saltwater clams, marine bivalve mollusks in the family Veneridae, the Venus clams. Species Species within the genus ''Petricolaria'' include: * '' Petricolaria dactylus'' (Sowerby, 1823) * '' Petricolaria pholadif ...
''.


Distribution


Indigenous

This species is native to the Eastern Coast of
North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...
including the Gulf of Mexico.


Introduced

This clam was introduced and has become established in the British Isles and on the
West Coast West Coast or west coast may refer to: Geography Australia * Western Australia *Regions of South Australia#Weather forecasting, West Coast of South Australia * West Coast, Tasmania **West Coast Range, mountain range in the region Canada * Britis ...
of
North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...
.''Petricolaria pholadiformis''
Marlin. Retrieved 2011-11-30.


References

Veneridae Bivalves described in 1818 {{bivalve-stub