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Psephoderma is a genus of placodont that was very similar to its relatives Placochelys and Cyamodus. Psephoderma had a flattened skull and a narrow, straight rostrom. Inside this skull, embeded in the jaws, were rounded teeth speciallized for crushing shellfish it ate. Unlike most placodonts, Psephoderma had a carapace that was divided into two pieces, one on the sholders and back, another on the rear end. Psephoderma grew to 180 cm long and lived in Triassic, about 210 million years ago. It was one of the last placodonts to live.
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