Trilobita - Asaphida - Asaphidae
Parent taxon: Asaphidae according to O. A. Hoel 1999
See also Harrington et al. 1959, Loch 2007, Neuman and Bruton 1974 and Owen 1981
Sister taxa: Anataphrus, Asaphellus, Asaphinae, Atopasaphus, Aulacoparia, Australopyge, Basilicus, Bellefontia, Birmanites, Bohemopyge, Borogothus, Brachyaspis, Branisaspis, Burminresia, Ectenaspis, Emanuelaspis, Eoasaphus, Eoisotelus, Fuyunia, Gerasaphes, Gogiura, Griphasaphus, Guohongjunia, Homalopyge, Hunnebergia, Isabelinia, Isyrakopeltis, Kainisiliellina, Kayseraspis, Klabavia, Kobayashia, Lachnostoma, Lisogorites, Lycophron, Merlinia, Metaptychopyge, Metayuepingia, Nahannia, Neopeltis, Nerudaspis, Nileoides, Ningkianites, Niobides, Niobina, Niobinae, Nobiliasaphinae, Nobiliasaphus, Norasaphus, Norinia, Ogmasaphus, Ogygiinae, Ogyginus, Ogygiocarinae, Ogygiocaris, Ogygites, Ogygitoides, Onchometopus, Parabellefontia, Paramegalaspis, Paratamdaspis, Penchiopsis, Plectasaphus, Popovkiaspis, Presbynileus, Priceaspis, Proasaphus, Promegalaspidinae, Proscharyia, Protopresbynileus, Protoptychopyge, Pseudasaphus, Pseudoasaphus, Pseudogriphasaphus, Pseudogygites, Pseudoptyocephalus, Psilocephalina, Ptychopyge, Ptychopyginae, Ptyocephalus, Sanbernardaspis, Stegnopsis, Stenorhachis, Suriaspis, Tchukeraspis, Thysanopyge, Trigonocerca, Trigonocercella, Valdaites, Vogdesia, Xenasaphus, Xenostegium, Zhenganites, Zuninaspis
Subtaxa: Golasaphus Hoekaspis Isoteloides Isotelus Megalaspides Megistaspis Notopeltis
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Silurian of United States (1: Georgia collection)
• Chazyan of Canada (18: Northwest Territories, Ontario, Quebec), United States (51: New York, Tennessee, Vermont)
• Whiterockian of Canada (16: Northwest Territories, Quebec), United States (20: Nevada, New York, Oklahoma, Vermont)
• Fennian of France (1)
• Volkhov of Argentina (1), Latvia (1), Norway (1), the Russian Federation (20), Sweden (28)
• Langevoja of Sweden (8)
• Hunderum of Sweden (1)
• Valaste of Sweden (1)
• Dawan of China (5)
• Arenig of Argentina (2), Bolivia (6), China (54), France (3), Morocco (1), Norway (1), Sweden (5), United States (3: New York, Vermont)
• Arenigian of Argentina (5), China (3), United States (2: Utah)
• Ordovician of Argentina (16), Australia (4), Belarus (1), Bolivia (3), Canada (90: British Columbia, Manitoba, Newfoundland, Newfoundland and Labrador, Northwest Territories, Nunavut, Nunvait, Ontario, Quebec, Québec), China (9), the Czech Republic (1), Estonia (8), France (2), Iran (3), Kazakhstan (1), Latvia (1), Lithuania (1), Norway (43), the Russian Federation (38), Spain (1), Sweden (59), the United Kingdom (12), United States (924: California, Georgia, Illinois, Illinois, Iowa, Indiana, Iowa, Iowa/Wisconsin, Kentucky, Maryland, Michigan, Minnesota, Missouri, Montana, Nevada, New York, Ohio, Oklahoma, Pennsylvania, Pennsylvania and Virginia, Tennessee, Utah, Virginia, Wisconsin)
• Canadian of Canada (2: Newfoundland, Newfoundland and Labrador)
• Tremadoc of Argentina (39), Bolivia (1), Canada (9: Alberta), China (1), Colombia (1), France (1)
• Skullrockian of Canada (1: Newfoundland)
• Ibexian of United States (2: Nevada)
• Cambrian of Australia (8)
Total: 1540 collections including 1695 occurrences