Trilobita - Ptychopariida - Catillicephalidae
Parent taxon: Ptychopariida according to H. B. Whittington et al. 1997
See also Adrain 2011
Sister taxa: Acrocephalitidae, Alokistocaridae, Amphorella, Atratebiinae, Bifodina, Bolaspididae, Bulnibarbi, Bvalbardites, Chondrastaulina, Chuangiformis, Cliffiidae, Conococheaquea, Conocoryphidae, Conokephalinidae, Crepicephalidae, 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: Acheilops Buttsia Calculites Catillicephala Cryptoderaspis Distazeris Galeaspis Lajishanaspis Madarocephalus Matania Onchonotellus Onchonotopsis Onchonotus Pemphigaspis Peracheilus Theodenisia Theodensia Triarthropsis Tumidulaspis Tuojiangella Urbanaspis Welleraspis Yukonaspis
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Ordovician of Canada (5: Newfoundland, Newfoundland and Labrador, Yukon collections), the United Kingdom (1)
• Tremadoc of Argentina (1), Canada (1: Newfoundland and Labrador)
• Ibexian of Norway (1)
• Cambrian of Antarctica (1), Australia (3), Canada (54: Alberta, Newfoundland, Newfoundland and Labrador, Quebec, Yukon), China (37), Greenland (13), Kazakhstan (29), the Russian Federation (9), United States (68: Alaska, Arkansas, Missouri, Nevada, New York, Pennsylvania, South Dakota, Texas, Utah, Vermont, Virginia, Wisconsin, Wyoming)
• Taoyuanian of China (8), the Russian Federation (3)
Total: 234 collections including 349 occurrences