Osteostraci
From Freepedia
Osteostraci (Cephalaspidiformes) are an extinct marine subgroup of the agnatha. They lived from the Middle Silurian to Late Devonian. Osteostraci possessed paired fin-like structures.
Osteostraci (Cephalaspidiformes) are an extinct marine subgroup of the agnatha. They lived from the Middle Silurian to Late Devonian. Osteostraci possessed paired fin-like structures.
