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Southwest Florida Shells with Emphasis on Sanibel & Captiva

By José H. Leal

Family Cuspidariidae

Cardiomya costellata

(Deshayes, 1835)

Precious Cardiomya

Shell size to 8 mm; shell delicate, thin, oval but with posterior end prolonged into a narrow canal-like expansion. Shell sculpture of 4-5 radial, widely separated curved ridges concentrated on central part of shell, and thin concentric lines. This species was until recently known as Cardiomya gemma A.E. Verrill & Bush, 1898.