Conodonta - Prioniodontida - Acodontidae
Parent taxon: Prioniodontida according to L. J. Pyle and C. R. Barnes 2002
Sister taxa: Anticostiodus, Balognathidae, Balognathoidea, Cyrtoniodontidae, Distomodontidae, Histiodella, Multioistodontidae, Oepikodus, Oistodontidae, Paracordylodontidae, Paracordylodus, Periodontidae, Phragmodus, Plectodinidae, Prioniodinida, Prioniodinina, Prioniodontacea, Rhipidognathidae, Sagittodontina, Strachanognathidae
Subtaxa: Acodus Diaphorodus Nealeodus Pteracontiodus Triangulodus Tripodus Tropodus
Ecology: nektonic carnivore
Distribution:
• Devonian of Canada (1: Ontario collection), the Czech Republic (2), Thailand (1)
• Silurian of Estonia (1), Malaysia (2), the United Kingdom (1), United States (90: California, Georgia, Indiana, Kentucky, Missouri, Ohio)
• Aluoja of Sweden (8)
• Whiterockian of United States (10: Nevada)
• Chazyan of United States (1: Tennessee)
• Volkhov of Estonia (12), the Russian Federation (6), Sweden (7)
• Dawan of China (3)
• Arenig of Argentina (3), China (15), the Russian Federation (1)
• Ordovician of Argentina (18), Australia (4), Canada (47: British Columbia, Newfoundland, Newfoundland and Labrador, Northwest Territories, Nunavut, Quebec), China (24), Estonia (11), Kazakhstan (1), Malaysia (11), Mexico (1), New Zealand (4), Peru (1), the Russian Federation (8), Spain (2), Sweden (2), Thailand (2), the United Kingdom (1), United States (8: Nevada, New York, Utah, Wyoming)
• Tremadoc of Argentina (4), China (14), Iran (5), Kazakhstan (1), the Russian Federation (6), South Korea (4), Sweden (5), United States (1: Virginia)
• Ibexian of United States (1: New York)
• Cambrian of Canada (1: Nunuvat), China (1)
• Taoyuanian of China (2)
Total: 354 collections including 440 occurrences