Conodonta - Prioniodontida - Oistodontidae
Parent taxon: Prioniodontida according to L. J. Pyle and C. R. Barnes 2002
See also Clark et al. 1981 and Sweet 1988
Sister taxa: Acodontidae, Anticostiodus, Balognathidae, Balognathoidea, Cyrtoniodontidae, Distomodontidae, Histiodella, Multioistodontidae, Oepikodus, Paracordylodontidae, Paracordylodus, Periodontidae, Phragmodus, Plectodinidae, Prioniodinida, Prioniodinina, Prioniodontacea, Rhipidognathidae, Sagittodontina, Strachanognathidae
Subtaxa: Graciloconus Juanognathinae Jumudontus Oistodontinae Oistodus Rossodus Tricostatus Tripodontinae
Ecology: nektonic carnivore
Distribution:
• Whiterockian of Canada (1: Northwest Territories collection), United States (4: Nevada)
• Fennian of Canada (1: New Brunswick)
• Volkhov of Estonia (1), the Russian Federation (1)
• Arenig of Argentina (3), China (18), the Russian Federation (1)
• Dawan of China (4)
• Arenigian of United States (1: Alaska)
• Ordovician of Argentina (13), Australia (3), Canada (38: British Columbia, Newfoundland, Northwest Territories), China (17), Estonia (7), Iran (1), Kazakhstan (2), Malaysia (4), Mongolia (1), New Zealand (6), Norway (1), the Russian Federation (14), Spain (2), Sweden (1), the United Kingdom (1), United States (24: Colorado, Minnesota, Missouri, Nevada, New Mexico, New York, Oklahoma, Texas, Utah, Wyoming)
• Tremadoc of Argentina (2), Canada (9: British Columbia), China (4), Kazakhstan (1), the Russian Federation (1), South Korea (4), Sweden (1), United States (6: Colorado, Nevada, Virginia)
• Ibexian of United States (1: New York)
Total: 199 collections including 243 occurrences