Pteraspidomorphi

Belongs within: Craniata.Contains: Amphiaspidiformes, Cyathaspidiformes, Pteraspidiformes, Psammosteiformes. The Pteraspidomorphi are an Ordovician to Devonian clade of jawless fishes bearing paired nasal sacs with separate openings and no nasohypophyseal canal (Bond 1996). <==Pteraspidomorphi [Pteraspides] | i. s.: Palaeospondylus gunniB96 |–+–Arandaspida [Arandaspidiformes, Arandaspidomorphi]MS16 | | | i. s.: *Anatolepis heintzi Bockelie & Fortey 1976TBN04, B96, H93 |… Continue reading Pteraspidomorphi