†unranked clade Cyclostomi Duméril 1806 (vertebrate)
Parent taxon: Vertebrata according to T. Miyashita et al. 2019
Sister taxa: Acrania, Agnatha, Ammopus, Anaspidomorphi, Anatolepis, Apedolepis, Artenolepis, Auchenaspis, Cephalaspidomorpha, Craniota, Eosaurus, Eotetrapoda, Galeaspida, Gnathostomata, Herpetichthyes, Hoplichnus, Hypichthyes, Lepidotosaurus, Mannodon, Myzichthyes, Osteostracomorphii, Ostracophori, Pachycardia, Palaeoxyris, Petromyzontida, Petromyzontomorphi, Pituriaspida, Protetrapoda, Saurornia, Thelodontomorphi, Tidaeus, Toxichnus, Zamponiopteron
Subtaxa: Myxinoidea Squirmarius
Ecology: