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osteostracan

Also found in: Hutchinson

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Noun

1.

osteostracan - 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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agnathan
cephalaspid

Cephalaspida
jawless fish

jawless vertebrate
Osteostraci

suborder Cephalaspida
suborder Osteostraci

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