Heterostracan

Pteraspis fish, side profile

Pteraspis fish, front view

Pteraspis armored fish hunting a school of foxface

Anglaspis is a heterostracan from the Early Devonian of ?

Pteraspis is an extinct genus of jawless ocean fish that ?

Drepanaspis is a jawless fish from the Early Devonian of ?

Ctenaspis is a jawless fish from the Early Devonian of ?

Drepanaspis gemuendenensis, an extinct primitive jawless ?

Pteraspis is an extinct genus of jawless fish

Prehistoric Pteraspis jawless fish swimming with a group of