Periplomatidae - Spoon Clams

Periplomatidae, the spoon clams, have round to ovate shells with a ridge or crease on the posterior end from the beak to the ventral edge. They are usually pearly white, small and fragile. Interiorly, they have prominent spoon-shaped chondrophores than hang down beneath the beak. They also have a hardened nodule (ossicle) beneath the beak, above the chondrophore. There are 2 species found in Texas.