Class Petromyzontida Bonaparte 1831 (vertebrate)
Synonym: Hyperoartia Müller 1844
Parent taxon: Cyclostomata according to T. Miyashita et al. 2021
See also Gadow 1898, Jordan 1963, Long 2011, Miyashita et al. 2019, Takezaki et al. 2003 and van der Laan 2019
Sister taxa: Anaspida, Conodontophorida, Hypospondyli, Myxini, Palaeospondyli, Petromyzontes
Subtaxa: Gilpichthyidae Petromyzontiformes Pipisciidae
Ecology: