PaleoDB taxon number: 7022
Alternative spelling: Polychaetia
Parent taxon: Annelida according to L. A. Parry et al. 2019
Sister taxa: Amphinomea, Aphanoneura, Burgessochaeta, Canadia, Chaetopoda, Clitellata, Ctenoscolex, Eunicea, Insolicorypha, Myzostomaria, Peronochaeta, Skolekichnus, Stephanoscolex, Terebellina, Thartharella, Tubulostium, Vermiforafacta
Subtaxa: Aciculata, Aeolosomatidae, Amphinomorpha, Arachnostega, Bundenbachochaeta, Campylites, Caprascolex, Drilomorpha, Ebetallites, Eopolychaetus, Eotrophonia, Eunicemorpha, Flabelligerimorpha, Geophilus proavus, Haileyia, Hammatopsis, Hesionites, Hirudopsis, Khemisina, Klakesia, Leodicidae, Lockportia, Microtubus, Nawnites, Oliveirania, 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