Synonym: Marsipobranchii
Parent taxon: Vertebrata according to T. Miyashita et al. 2021
See also Bardack and Zangerl 1968, Gadow 1898, Jaekel 1911 and Jordan 1963
Sister taxa: Acrania, Agnatha, Ammopus, Anaspidomorphi, Apedolepis, Artenolepis, Cephalaspidomorpha, Craniota, Cyclostomi, Eosaurus, Eotetrapoda, Galeaspida, Gnathostomata, Herpetichthyes, Hoplichnus, Hypichthyes, Lepidotosaurus, Mannodon, Myzichthyes, Ophis, Osteostracomorphi, Ostracophori, Pachycardia, Palaeoxyris, Petromyzontomorphi, Pituriaspida, Protetrapoda, Pteraspidomorphi, Saurornia, Thelodontomorphi, Thoracophis, Tidaeus, Toxichnus, Zamponiopteron, Conodontomorpha, Coluber arcuatus, Myxinomorphi, Myllokunmingiiformes
Subtaxa: Anaspida Conodontophorida Hypospondyli Myxini Palaeospondyli Petromyzontes Petromyzontida
Ecology: