A member of the Coccostei, a family of extinct armored fish from the Devonian period that had thick bone plates protecting their heads.
From Coccosteus plus -id (member of). The genus name Coccosteus comes from Greek kokkos (berry) plus osteon (bone).
These fish were basically underwater tanks—their whole head was encased in bone so thick and heavy that they could only move slowly, yet they were apex predators of their ancient seas.
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