Trilobita - Asaphida - Asaphidae
Parent taxon: Asaphidae according to O. A. Hoel 1999
See also Harrington et al. 1959, Neuman and Bruton 1974 and Owen 1981
Sister taxa: Anataphrus, Araiocaris, Asaphellus, Asaphinae, Atopasaphus, Aulacoparia, Australopyge, Basilicus, Bellefontia, Birmanites, Bohemopyge, Brachyaspis, Branisaspis, Burminresia, Emanuelaspis, Eoasaphus, Eoisotelus, Fuyunia, Gerasaphes, Griphasaphus, Guohongjunia, Hemigyraspis, Homotelus, Hunnebergia, Isabelinia, Kayseraspis, Klabavia, Kobayashia, Lachnostoma, Liomegalaspides, Lisogorites, Megalaspidella, Merlinia, Metaptychopyge, Mioptychopyge, Nahannia, Nerudaspis, Nileoides, Ningkianites, Niobella, Niobides, Niobina, Niobinae, Nobiliasaphus, Norinia, Ogmasaphus, Ogygiinae, Ogyginus, Ogygiocarella, Ogygiocaris, Ogygites, Ogygitoides, Onchometopus, Parabellefontia, Paramegalaspis, Paratamdaspis, Penchiopsis, Plectasaphus, Presbynileus, Priceaspis, Promegalaspidinae, Proscharyia, Protopresbynileus, Protoptychopyge, Pseudasaphus, Pseudoasaphus, Pseudogriphasaphus, Pseudogygites, Psilocephalina, Ptychopyge, Ptychopyginae, Ptyocephalus, Sanbernardaspis, Schizophorus, Stegnopsis, Stenorhachis, Suriaspis, Thysanopyge, Trigonocerca, Trigonocercella, Vogdesia, Xenostegium, Zhenganites, Zuninaspis
Subtaxa: Fitzroyaspis Golasaphus Hoekaspis Isoteloides Isotelus Megalaspides Megistaspis Notopeltis
Ecology: fast-moving low-level epifaunal deposit feeder
Distribution:
• Silurian of United States (1: Georgia collection)
• Ordovician of Argentina (51), Australia (2), Belarus (1), Bolivia (4), Canada (94: Alberta, Manitoba, Newfoundland, Newfoundland and Labrador, Northwest Territories, Nunavut, Nunvait, Ontario, Quebec, Québec), China (9), Colombia (1), the Czech Republic (1), Estonia (8), France (4), Iran (3), Kazakhstan (1), Norway (44), the Russian Federation (52), Spain (1), Sweden (93), the United Kingdom (8), United States (867: 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, Vermont, Virginia, Wisconsin)
• Llandeilo of China (1)
• Chazy of Canada (2: Ontario, Quebec), United States (52: New York)
• Whiterockian of Canada (16: Northwest Territories, Quebec), United States (19: Nevada, New York, Oklahoma, Vermont)
• Dawan of China (5)
• Cassinian of Canada (11: Newfoundland, Newfoundland and Labrador, Quebec), United States (40: Oklahoma, Utah)
• Arenig of Argentina (2), Australia (7), Bolivia (6), China (54), France (3), Morocco (1), Norway (1), Sweden (5), United States (3: New York, Vermont)
• Arenigian of Argentina (5), China (5), United States (2: Utah)
• Canadian of Canada (2: Newfoundland, Newfoundland and Labrador)
• Jeffersonian of Canada (5: Newfoundland, Newfoundland and Labrador), United States (1: Oklahoma)
• Cambrian of Australia (8)
Total: 1501 collections including 1650 occurrences