Petromyzontida - Cephalaspidiformes

Parent taxon: Osteostraci according to R. S. Sansom 2009

See also Sansom 2008

Sister taxa: Aachenaspis, Fieldingaspis, Meelaidaspis, Ohesaareaspis, Tuvaspis, Cornuata, Tremataspidida, Benneviaspidida, Benneviaspidiformes, Camptaspis, Waengsjoeaspis, Tremataspidiformes, Yvonaspis, Ateleaspidiformes, Zenaspidida

Subtaxa: Auchenaspis Ilemoraspis Kiaeraspidoidea Procephalaspis Thyestes Tremataspidoidea Witaaspis

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Ecology: fast-moving nektonic carnivore

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