Alternative spelling: Polychaetia
Parent taxon: Annelida according to L. A. Parry et al. 2019
See also Barnes 1998, Martin 1904, Sepkoski 2002, Squires 1984, Squires 1987, Squires 1988 and Zrzavy et al. 1998
Sister taxa: Amphinomea, Aphanoneura, Burgessochaeta, Chaetopoda, Clitellata, Cloudinidae, Ctenoscolex, Insolicorypha, Myzostomaria, Palaeoannelida, Peronochaeta, Skolekichnus, Stephanoscolex, Terebellina, Thartharella, Tubulostium, Vermiforafacta
Subtaxa: Aciculata Aeolosomatidae Amphinomorpha Arachnostega Bundenbachochaeta Campylites Caprascolex Drilomorpha Ebetallites Eopolychaetus Eotrophonia Eunicemorpha Eunicida Flabelligerimorpha Geophilus proavus Haileyia Hammatopsis Hesionites Hirudopsis Khemisina Klakesia Leodicidae Lockportia Microtubus Miskoa Nawnites Oliveirania Onuphionella Palaeotubus Palpata Parergodrilidae Phragmochaetidae Phyllodocemorpha Pontobdellopsis Potamodrilidae Propolynoe Psammodrilidae Pyllodocida Ramesses Ruedemannella Sarcionata Schizoproboscina Scolecida Sedentaria Sedentarida Serpulimorpha Siboglinidae Soris Spiomorpha Spiroglyphus Stoma Terebellomorpha Tosalorbis Tubicola Tubulelloides Tymbochoos
Ecology: epifaunal detritivore