Brief Summary
provided by Ecomare
The American piddock is an elongated white shell. It was introduced into the southeastern section of the North Sea at the end of the 19th century. It drills itself into wood and blocks of peat with the toothed ribs of its shell as grater. It doesn't eat the wood or peat, but filters plankton out of the seawater. Other piddocks also have the same lifestyle, even though they are not related to one another. The American piddock is displacing the indigenous white piddock and oval piddock.
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False angelwing
provided by wikipedia EN
Petricolaria pholadiformis, common names false angelwing, or false angel wing (US), and American piddock (UK), is a species of saltwater clam, a marine bivalve mollusk in the family Veneridae, the Venus clams.
Description
Petricolaria pholadiformis closely resembles the angel wing (Cyrtopleura costata), 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 5 centimetres (2.0 in) 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.[1]
Right and left valve of the same specimen:
Taxonomy
Petricolaria pholadiformis was formerly classified under genus Petricola as Petricola pholadiformis but has since been reclassified under genus Petricolaria.[2]
Distribution
Indigenous
This species is native to the Eastern Coast of North America including the Gulf of Mexico.[1]
Introduced
This clam was introduced and has become established in the British Isles and on the West Coast of North America.[3][4]
A beachworn right
valve of
Petricolaria pholadiformis, from
Wales
References
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False angelwing: Brief Summary
provided by wikipedia EN
Petricolaria pholadiformis, common names false angelwing, or false angel wing (US), and American piddock (UK), is a species of saltwater clam, a marine bivalve mollusk in the family Veneridae, the Venus clams.
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Alien species
provided by World Register of Marine Species
De Amerikaanse boormossel Petricolaria pholadiformis kwam oorspronkelijk enkel langs de oostkust van Noord-Amerika voor, maar werd omstreeks 1890 naar Europa gebracht (Engeland) samen met het transport van Amerikaanse kweekoesters Crassostrea virginica. De planktonische larven van de boormossel konden vervolgens de rest van Europa bereiken door mee te liften in zeestromingen. De soort werd voor het eerst in Belgische wateren waargenomen in Nieuwpoort in 1899. Nu leeft de soort vooral ter hoogte van onze oost- en middenkust. Deze tweekleppige boort gangen in turf- en veenblokken, hout, harde klei en kalksteen. In aanspoelende veenblokken zijn vaak levende individuen terug te vinden. Lege schelpen spoelen vaak aan op onze stranden.
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Alien species
provided by World Register of Marine Species
The natural distribution area of the false angelwing Petricolaria pholadiformis was limited to the east coast of North America, but was brought to Europe (England) around 1890 together with the transport of the eastern oyster Crassostrea virginica. The planktonic larvae of the false angelwing could subsequently reach the rest of Europe by hitch hiking on the sea currents. The species was first observed in Belgian waters at Nieuwpoort in 1899. In Today, the false angelwing can mainly be found along the east part of Belgian's coast. This bivalve drills passageways in peat blocks, wood, hard clay and limestone. Living individuals are often found in washed ashore peat blocks. Empty shells are frequently found on Belgian beaches.
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Distribution
provided by World Register of Marine Species
Gulf of St. Lawrence (unspecified region), southern Gaspe waters (Baie des Chaleurs, Gaspe Bay to American, Orphan and Bradelle banks; eastern boundary: eastern Bradelle Valley), Magdalen Islands (from eastern Bradelle valley to the west, as far as Cape North, including the Cape Breton Channel); Prince Edward Island (from the northern tip of Miscou Island, N.B. to Cape Breton Island south of Cheticamp, including the Northumberland Strait and Georges Bay to the Canso Strait causeway); Cobscook Bay
North-West Atlantic Ocean species (NWARMS)
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Habitat
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infralittoral of the Gulf and estuary
North-West Atlantic Ocean species (NWARMS)
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