cephalaspid

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Noun1.cephalaspid - extinct jawless fish of the Devonian with armored head
agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
Cephalaspida, Osteostraci, suborder Cephalaspida, suborder Osteostraci - extinct group of armored fish-like vertebrates; taxonomy is not clear