Fish Chordata Bilateria Animals Life Existence
Pteraspidomorphi Extinct jawless fish with extensive dermal armor covering their heads which lived during the Early Ordovician to the Late Devonian period.
(Taxonomic Rank: Superclass)

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	Arandaspis   Order: Arandaspidiformes Astraspis   Order: Astraspidiformes Cardipeltis   Order: Cardipeltida Corvaspis   Order: Corvaspidida Cyathaspis   Order: Cyathaspidiformes Lepidaspis   Order: Lepidaspidida Protaspis   Order: Pteraspidiformes Protopteraspis   Order: Pteraspidiformes Pteraspis   Order: Pteraspidiformes Tolypelepis   Order: Tolypelepidida
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