Synonyms: Cephalaspidomorphi Moy-Thomas and Mile 1971, Monorhina
Parent taxon: Vertebrata according to R. Van Der Laan 2019
See also Gadow 1898, Jaekel 1911, Long 2011, Nelson et al. 2016 and Sepkoski 2002
Sister taxa: Acrania, Agnatha, Ammopus, Anaspidomorphi, Anatolepis, Apedolepis, Artenolepis, Auchenaspis, Cephalaspidomorpha, Craniota, Cyclostomi, Eosaurus, Eotetrapoda, Galeaspida, Gnathostomata, Herpetichthyes, Hoplichnus, Hypichthyes, Lepidotosaurus, Mannodon, Myzichthyes, Osteostracomorphii, Ostracophori, Pachycardia, Palaeoxyris, Petromyzontomorphi, Pituriaspida, Protetrapoda, Saurornia, Thelodontomorphi, Tidaeus, Toxichnus, Zamponiopteron
Subtaxa: Atelaspidiformes Ateleaspis Birkeniiformes Cephalaspidida Cephalaspidiformes Galeaspidiformes Gilpichthyidae Pipisciidae Pituriaspidiformes
Ecology: fast-moving nektonic carnivore