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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
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References in periodicals archive ?
Reproductive morphology, mating behavior, and spawning ecology of cephalaspid sea slugs (Aglaji-dae and Gastropteridae).
This pattern is not unique for the Pulmonata, but is shared by a great number of Opisthobranchia, especially the cephalaspid stem group.
A new cephalaspid fish from the Downtonian of Scotland, with notes on the structure and classification of ostracoderms.
At the opposite extreme, Schaefer and Ruthensteiner (2001) and Ruthensteiner and Schaefer (2002) found no evidence of an external pore for ampullary neurons in a selection of cephalaspid and pulmonate veligers.
Cephalaspids (= osteostracans) from the Lochkovian MOTH locality of the Northwest Territories were described by Dineley and Loeffler (1976) and Adrain and Wilson (1994), but none has an ornament that closely resembles the Eastport Formation specimens.