Relating to or belonging to the Coccostei, an extinct group of ancient fish with bony armor-like plates on their heads.
From Coccosteus (genus name from Greek kokkos berry plus osteon bone, likely referring to rounded bone structures) plus -an (relating to).
Coccostean fish lived 400 million years ago and had faces covered in thick bone armor with huge jaw muscles—imagine a creature that looked like it wore a knight's helmet!
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