- jawless vertebrate, jawless fish, agnathan - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
--1 is a kind of aquatic vertebrate
--1 is a member of Agnatha, superclass Agnatha
--1 has particulars:ostracoderm; heterostracan; osteostracan, cephalaspid; anaspid; conodont; cyclostome; lamprey, lamprey eel, lamper eel; hagfish, hag, slime eels