Pteraspidomorphi

From Freepedia

Pteraspidomorphi is an extinct taxon of early jawless fish. The fossils show extensive shielding of the head. Maybe some species even lived in fresh water. They are considered as vertebrates. The taxon contains the subgroups Heterostraci, Astraspida, Arandaspida and Eriptychiida.

See also

• http://tolweb.org/tree?group=Pteraspidomorphi&contgroup=Vertebrate
• Fish