False angelwing

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Petricolaria pholadiformis
Petricola pholadiformis-Nl2.jpg
Paired valves of Petricolaria pholadiformis
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Veneroida
Family: Petricolidae
Genus: Petricolaria
Species: P. pholadiformis
Binomial name
Petricolaria pholadiformis
(Lamarck, 1818)

Petricola pholadifomis Lamarck, 1818

Petricolaria pholadiformis, common names "false angel wing" (United States) and "American piddock" (UK), is a species of saltwater clam, a marine bivalve mollusk in the family Petricolidae, which is related to the large family Veneridae, the Venus clams.


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]



This species is native to the Eastern Coast of North America including the Gulf of Mexico.[1]


This clam was introduced and has become established in the British Isles, and on the West Coast of North America.[2][3]

A beachworn right valve of Petricolaria pholadiformis, from Wales


  1. ^ a b False Angel Wing: A Piddock for Your Thoughts Retrieved 2011-11-30.
  2. ^ False Angelwing: Petricolaria pholadiformis Elkhorn Slough Research. Retrieved 2011-11-30.
  3. ^ Petricolaria pholadiformis Archived 2010-02-06 at the Wayback Machine. Marlin. Retrieved 2011-11-30.