Species Account

Anadara transversa (Say, 1822)

Arcoidea : Arcidae

Tebble name:
Smith & Heppell name:

To size: To 38 mm. Shell Structure: Solid shell. Equivalve: Equivalve. Equilateral: Inequilateral, beaks to the anterior. Tumidity: Tumid. Outline: Short, rounded boat shape, longer than high, rounded posterior and anterior margins. No byssal gape.

Sculpture: Radial ribs (30-35), left valve has feint beading. Margin: Crenulated margin, an extension of the radial ribs. Ligament: Brown band visible from the external and runs entire length of dorsal margin. Appears striped lengthwise. Hinge: Taxodont, numerous small teeth set on a thin hinge plate. Pallial Musculature: Anterior adductor muscle round and slightly smaller than the posterior. Periostracum: Brown, very thin, wears off easily. Colour: Cream to white.

Distribution & Ecology

Massachusetts and south through to Caribbean, byssally attached to rocks in shallow water.

In Britain and Ireland found in Co. Claire, Ireland inside a small blue plastic toy boat along with Argopecten gibbus.

Depth Range

Additional Information & Related Species


Listed are literature citing Anadara transversa (Say, 1822). Reference containing the species Type Description is highlighted.

Demir, M. 1977. On the presence of Arca (Scapharca) amygdalum Philippi, 1847 in the harbour of Izmir, Turkey. Istanbul University Fen. Fak. Mec. Series B. 42: 197-202.
Say, T. 1822. An account of some of the marine shells of the United States. Journal of the Academy of Natural Sciences, Philadelphia. 2(2): 257-276.


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Record last modified: 03/03/2022