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Southwest Florida Shells with Emphasis on Sanibel & Captiva

José H. Leal

Family Arcidae


Anadara transversa

(Say, 1822)

Transverse Ark

Shell size to 40 mm; shell oblong, inequivalve, with left valve larger, overlapping right valve. Hinge straight. Sculpture of 30-35 radial ribs. Smallest species in genus Anadara. Periostracum dark-brown. Color white. This species has been reported in an 2012 article published by Susan Hewitt in The Festivus as the most common shell found on Sanibel beaches.

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