Pteraspidiformes Panamintaspis Protopteraspididae Wood Bay Formation Protaspididae Hibernaspidoidei Sacabambaspis Protaspis Apedolepis Arandaspida Astraspis Arandaspis Doryaspis Pteraspidomorphi
Pteraspidiformes Panamintaspis Protopteraspididae Wood Bay Formation Protaspididae Hibernaspidoidei Sacabambaspis Protaspis Apedolepis Arandaspida Astraspis Arandaspis Doryaspis Pteraspidomorphi