Class Clitellata
Parent taxon: Annelida according to S. Štamberg and J. Zajíc 2008
See also Zrzavy et al. 1998
Sister taxa: Amphinomea, Aphanoneura, Burgessochaeta, Chaetopoda, Ctenoscolex, Insolicorypha, Myzostomaria, Palaeoannelida, Peronochaeta, Pleistoannelida, Polychaeta, Sabelliditida, Skolekichnus, Stephanoscolex, Terebellina, Thartharella, Tubulostium, Vermiforafacta
Subtaxa: Oligochaeta