Trilobita - Phacopida - Cheiruridae

Full reference: W. R. Evitt. 1951. Some Middle Ordovician trilobites of the families Cheiruridae, Harpidae, and Lichidae. Journal of Paleontology 25(5):587-616

Parent taxon: Cheiruridae according to P. A. Jell and J. M. Adrain 2003

Sister taxa: Acanthoparyphinae, 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, 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: Heliomeroides alacer, Heliomeroides evitti, Heliomeroides freschaufae, Heliomeroides raymondi, Heliomeroides teres, Heliomeroides treta

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Type: Heliomeroides teres

Ecology: fast-moving low-level epifaunal carnivore