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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
References in periodicals archive ?
A new cephalaspid fish from the Downtonian of Scotland, with notes on the structure and classification of ostracoderms.
The Early Devonian fish assemblages include, besides the dominating amphiaspidids, also cephalaspids, different placoderms, acanthodians, sarcopterygians (porolepiforms) and actinopterygians.
These previously discovered eurypterids are from the western exposure of the Campbellton Formation and are believed to have inhabited a coastal deltaic setting, along with a rich vertebrate assemblage that included cephalaspids, placoderms, acanthodians, and sharks.