Parent taxon: Vertebrata according to H. Gadow 1898

Sister taxa: Acrania, Agnatha, Ammopus, Anaspidomorphi, Anatolepis, Apedolepis, Artenolepis, Cephalaspidomorpha, Cyclostomi, Eosaurus, Eotetrapoda, Galeaspida, Gnathostomata, Herpetichthyes, Hoplichnus, Hypichthyes, Lepidotosaurus, Mannodon, Myzichthyes, Ophis, Osteostracomorphii, Ostracophori, Pachycardia, Palaeoxyris, Petromyzontida, Petromyzontomorphi, Pituriaspida, Protetrapoda, Saurornia, Thelodontomorphi, Thoracophis, Tidaeus, Toxichnus, Zamponiopteron

Subtaxa: Cyclostomata Hypostomata

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