cyclostome

English Thesaurus

1. primitive aquatic vertebrate (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	:	cyclostomata, order cyclostomata,
definition	:	primitive jawless aquatic vertebrate: lampreys; hagfishes (noun.animal)