Petromyzontida - Cephalaspidiformes

Full reference: D. V. Obruchev. 1964. Branch Agnatha. In D. V. Obruchev (ed.), Fundamentals of Paleontology. Vol. XI. Agnatha, Pisces. Izdatel'stvo "Nauka", Moscow 36-167

Parent taxon: Osteostraci according to D. V. Obruchev 1964

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

Subtaxa: Tannuaspididae

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Ecology: fast-moving nektonic carnivore

Distribution: there are no occurrences of Tremataspidida in the database

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