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(class Placodermi)

Group or order of fossil, Devonian Period, fish, possibly related to sharks. The trunk shield, which was larger than the head shield, possessed a pair of movable, spine-like pectoral fins. The fossils may reach a length of about 30 cm, and show a subterminal mouth as well as a heterocercal tail.

Subjects: Zoology and Animal Sciences.

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