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Pteraspidomorphi

 

 
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Pteraspidomorphi
 
 
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Pteraspidomorphi is an extinct subclass of early jawless fish. The fossils show extensive shielding of the head. Some species may have lived in fresh water. The taxon contains the subgroups Heterostraci
Heterostraci

Heterostraci is an extinct Class of jawless vertebrate that lived primarily in Marine and estuary environments. They arose during the Silurian, and all, save for the Psammosteids, became extinct during the late Devonian....
, Astraspida, Arandaspida and Eriptychiida
Eriptychiida

Eriptychiida are an extinct Marine taxon of vertebrate in the group Pteraspidomorphi.The Eriptychiida contain only one genus, the Eriptychius, and fossilized specimens from this genus have been found in North America....
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Pteraspidomorphi is an extinct subclass of early jawless fish. The fossils show extensive shielding of the head. Some species may have lived in fresh water. The taxon contains the subgroups Heterostraci
Heterostraci

Heterostraci is an extinct Class of jawless vertebrate that lived primarily in Marine and estuary environments. They arose during the Silurian, and all, save for the Psammosteids, became extinct during the late Devonian....
, Astraspida, Arandaspida and Eriptychiida
Eriptychiida

Eriptychiida are an extinct Marine taxon of vertebrate in the group Pteraspidomorphi.The Eriptychiida contain only one genus, the Eriptychius, and fossilized specimens from this genus have been found in North America....
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