Trilobita - Phacopida - Cheiruridae
Full reference: H. B. Whittington and W.R., I.I. Evitt. 1953. Silicified Middled Ordovician trilobites. Geological Society of America Memoir 59:1-139
Parent taxon: Cheiruridae according to J. M. Adrain 1998
Sister taxa: Actinopeltis, Anasobella, Areia, Areiaspis, Borealaspis, Ceraurinella, Ceraurinus, Cerauroides, Cerauromeros, Ceraurus, Cheirurinae, Cheirurus, Chiozoon, Contracheirurus, Crotalocephalina, Crotalocephalus, Cydonocephalus, Cyrtometopella, Cyrtometopus, Deiphon, Didrepanon, Eccoptochile, Gabriceraurus, Hadromeros, Heliomera, Heliomeroides, Hemisphaerocoryphe, Holia, Hyrokybe, Junggarella, Kawina, Ktenoura, Lehua, Nieszkowskia, Onycopyge, Osekaspis, Pandaspinapyga, Paraceraurus, Parayoungia, Parisoceraurus, Pateraspis, Placoparina, Proromma, Protocerauroides, Pseudocheirurus, Pseudosphaerexochus, Radiurus, Remipyga, Skelipyx, Sphaerexochus, Sphaerocoryphe, Sphaexerochinae, Stubblefieldia, Sycophantia, Valongia, Whittakerites, Xystocrania, Youngia
Subtaxa: Acanthoparypha
Ecology: fast-moving low-level epifaunal carnivore