- Ostracodermi, order Ostracodermi - extinct group of armored jawless vertebrates; taxonomy is not clear
--1 is a kind of animal order
--1 is a member of Agnatha, superclass Agnatha
--1 has members:ostracoderm; Heterostraci, suborder Heterostraci; Osteostraci, suborder Osteostraci, Cephalaspida, suborder Cephalaspida