Superclass Cyclostomata Richards
PaleoDB taxon number: 389304
Synonyms: Marsipobranchii (no. 352180), Monorhina (no. 217372)
Parent taxon: Craniota according to H. Gadow 1898
Sister taxon: Hypostomata
Subtaxa: Hypospondyli, Palaeospondyli, Petromyzontes