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Southwest Florida Shells with Emphasis on Sanibel & Captiva
José H. Leal
Family Cuspidariidae
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Cardiomya costellata
(Deshayes, 1835)
Precious Cardiomya
![](http://res.cloudinary.com/bailey-matthews-shell-museum/image/upload/v1430079952/tkyzsljvcicwtpemjnrd.jpg)
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.
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