Trilobita - Ptychopariida - Crepicephalidae
Full reference: T. Kobayashi. 1935. On the Kainella fauna of the basal Ordovician age found in Argentina. Japanese Journal of Geology and Geography 12(1):59-67
Parent taxon: Ptychopariida according to J. C. Lamsdell and P. A. Selden 2015
See also Adrain 2011, Whittington et al. 1997 and Wilson 1954
Sister taxa: Acrocephalitidae, Alokistocaridae, Amphorella, Atratebiinae, Bifodina, Bolaspididae, Bulnibarbi, Bvalbardites, Catillicephalidae, Chondrastaulina, Chuangiformis, Cliffiidae, Conococheaquea, Conocoryphidae, Conokephalinidae, Diceratocephalidae, Elviniidae, Harpina, Indiligens, Kazelina, Kingstoniidae, Kirengelia, Lisaniidae, Lonchocephalidae, Lorenzellidae, Marjumiidae, Meniscocorphye, Meniscocoryphe, Menomoniidae, Neoanomocerella, Norwoodiidae, Olenina, Papyriaspididae, Phylacteridae, Plethopeltidae, Proasaphiscidae, Propeltura, Ptychopariidae, Ptychopariina, Ptychoparoides, Raymondinidae, Shumardiidae, Solenopleuracea, Solenopleuridae, Tricrepicephalidae, Xianquianaspis, Yuehsieszella
Subtaxa: Bagongshania Coosia Coosina Coosinoides Crepicephalina Crepicephalus Hsuchuangia Idioura Kasatchaspis Sinocoosella Sinocrepicephalus Temnoura Uncaspis Zaozhuangaspis
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Taoyuanian of Turkey (1 collection)
• Cambrian of Australia (1), Canada (23: Newfoundland, Newfoundland and Labrador, Northwest Territories, Nunavut, Yukon), China (26), Greenland (4), United States (93: Georgia, Nevada, Pennsylvania, South Dakota, Tennessee, Texas, Utah, Virginia, Wisconsin, Wyoming, Wyoming-Montana)
Total: 148 collections including 257 occurrences