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Coccosteus (meaning "Seed Bone") was a arthrodire placoderm fish that lived during the Devonian period. It appeared in middle Devonian.

The largest specimens were about 40 centimetres (16 in), although the average length was 20 to 24 centimetres (7.9 to 9.4 in). Like other arthrodires, Coccosteus had a joint between the armor of the body and skull.

In addition, it also had an internal joint between its neck vertebrae and the back of the skull, allowing for the mouth to be opened even wider. Coccosteus fossils have been found throughout Europe and North America.