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, Strachanognathidae
Subtaxa: Diaphorodus Nealeodus Pteracontiodus Triangulodus Tripodus Tropodus
Ecology: nektonic carnivore
Distribution:
• Billingen of Estonia (4 collections)
• Arenig of Argentina (3), China (5)
• Ordovician of Argentina (14), Australia (3), Canada (39: British Columbia, Newfoundland, Newfoundland and Labrador), China (10), Estonia (14), Malaysia (4), New Zealand (4), the Russian Federation (9), South Korea (1), Sweden (8), the United Kingdom (1)
• Ibexian of United States (1: New York)
Total: 120 collections including 139 occurrences