Parent taxon: Polychaeta according to C. T. S. Little et al. 2004
See also Higgs et al. 2012 and Rouse et al. 2004
Sister taxa: Aciculata, Aeolosomatidae, Amphinomorpha, Arachnostega, Bundenbachochaeta, Caprascolex, Drilomorpha, Ebetallites, Eopolychaetus, Eotrophonia, Eunicemorpha, Eunicida, Flabelligerimorpha, Geophilus proavus, Haileyia, Hammatopsis, Hesionites, Hirudopsis, Khemisina, Klakesia, Leodicidae, Lockportia, Maucheria, Microtubus, Miskoiida, Nawnites, Oliveirania, Onuphionella, Palaeotubus, Palpata, Parergodrilidae, Phragmochaetidae, Phyllodocemorpha, Pontobdellopsis, Potamodrilidae, Propolynoe, Psammodrilidae, Pyllodocida, Ramesses, Ruedemannella, Sarcionata, Schizoproboscina, Sedentarida, Serpulimorpha, Soris, Spiomorpha, Spiroglyphus, Stoma, Terebellomorpha, Tosalorbis, Tubicola, Tubulelloides, Tymbochoos
Subtaxa: Osedax
Ecology: stationary intermediate-level epifaunal chemosymbiotic
Distribution:
• Quaternary of United States (1: California collection)
• Pliocene of Italy (1), Spain (1)
• Oligocene of United States (6: Washington)
• Jurassic of United States (1: California)
Total: 10 collections including 11 occurrences