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  • José H. Leal

The Flattened Carditid


In the last two weeks I introduced the bivalves Broad-Ribbed Carditid and Three-Tooth Carditid. Today, to complete the conversation about local members of the family Carditidae, I want to “invite to the podium” the Flattened Carditid, Pteromeris perplana (Conrad, 1841). A small bivalve, reaching only about ¼-inch, this species has a very flat shell, a feature indicated in the specific name, the Latin compound word perplana, which translates into “hyper flat”. The shell is triangular, but with a “twisted” beak. Its sculpture consists of about 12–15 ribs, and the color whitish or pinkish with brown chevron-like markings. The interior of the shell valves is almost always brown.


The Flattened Carditid, Pteromeris perplana, from Sanibel. Photo by José H. Leal.

The Flattened Carditid, Pteromeris perplana, from Sanibel. Photo by José H. Leal.

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