- osteostracan, cephalaspid - extinct jawless fish of the Devonian with armored head
--1 is a kind of jawless vertebrate, jawless fish, agnathan
--1 is a member ofOsteostraci, suborder Osteostraci, Cephalaspida, suborder Cephalaspida
Osteostraci, suborder Osteostraci, Cephalaspida, suborder Cephalaspida |