anaspid

English Thesaurus

1. extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian (noun.animal)

hypernym	:	agnathan, jawless fish, jawless vertebrate,
definition	:	eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms (noun.animal)

member meronym	:	anaspida, order anaspida,
definition	:	extinct order of jawless vertebrates (noun.animal)