Alternative spelling: Agnathi
Parent taxon: Vertebrata according to N. Takezaki et al. 2003
See also Dineley and Metcalf 1999, Ritchie and Gilbert-Tomlinson 1977, Säve-Söderbergh 1934 and Shu et al. 1999
Sister taxa: Acrania, Ammopus, Anaspidomorphi, Apedolepis, Artenolepis, Cephalaspidomorpha, Craniota, 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: Anatolepis Haikouichthys Hyperoartia Loganiida Muzaffarabadmachli Myllokunmingia Myllokunmingiida Pircanchaspis Pituriaspida Saarolepis
Ecology: