| Cephalaspis | ‖n. [ NL., fr. Gr. |
| osteostracan | (n) extinct jawless fish of the Devonian with armored head, Syn. cephalaspid |
| osteostraci | (n) extinct group of armored fish-like vertebrates; taxonomy is not clear, Syn. Cephalaspida, suborder Osteostraci, suborder Cephalaspida |