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)
• Billingen of Estonia (6), the Russian Federation (1)
• Arenig of Argentina (3), China (18), the Russian Federation (1)
• Arenigian of United States (1: Alaska)
• Dawan of China (4)
• Ordovician of Argentina (15), Australia (4), Canada (48: British Columbia, New Brunswick, Newfoundland, Northwest Territories), China (21), Estonia (2), Iran (1), Kazakhstan (3), Malaysia (4), Mongolia (1), New Zealand (6), Norway (1), the Russian Federation (16), South Korea (4), Spain (2), Sweden (2), the United Kingdom (1), United States (30: Colorado, Minnesota, Missouri, Nevada, New Mexico, New York, Oklahoma, Texas, Utah, Virginia, Wyoming)
• Ibexian of United States (1: New York)
Total: 201 collections including 245 occurrences