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animal
>
Single rib clams are
单肋蛤属
monopleura
斧足纲(pelecypoda,蛤类)已绝灭的和异常的属。化石见于白垩系。代表厚齿类的畸变蛤类。三角形厚壳被一个小得多的圆盖状壳覆盖著。有些厚齿类中, 壳上有使液体流过的通道。该属及其他厚齿类习性上是因定附著的。动物明显垂直生长,以尖端固定于海底。