Parent taxon: Conodonta according to P. Janvier 1997
Sister taxa: Acodina, Aldridgeodus, Aldridgeognathus, Amphigeisinidae, Ancidontus, Ancyrogondolella, Apteracontiodus, Belodellida, Bengtsonella, Branmehla, Chengyuania, Coleodontidae, Costiconus, Dasytodus, Diaphanodus, Dischidognathus, Distacodidae, Dolborodina, Enantiognathus, Euconodonta, Euconodonta, Fahraeosodus, Falcodus, Gagievodus, Gobduntaulepis, Heterdontoides, Hindeodella andrusovi, Iowagnathus, Llandoverygnathus, Lundodus, Minimodus, Nasusgnathus, Noixodontus, Omanognathus, Oslodus, Ozarkodinida, Palmatodella, Panderodontida, Pandorinella, Paraconodontida, Parvigondolella, Pollognathus, Polygnathida, Polyplacognathida, Prioniodontida, Protopanderodontida, Pseudobelodella, Rexroadus, Rhynchognathodus, Rotundoconus, Sagittodontus, Silurognathus, Spathognathodus, Tardogondolella, Trichonodella, Youngquistognathus, Zygognathus
Subtaxa: Proconodontida
Ecology: nektonic carnivore
Distribution:
• Silurian of Malaysia (2 collections)
• Aluoja of Sweden (8)
• Whiterockian of United States (1: Nevada)
• Billingen of Estonia (1)
• Arenig of Argentina (2), China (3)
• Arenigian of United States (1: Alaska)
• Ordovician of Argentina (11), Australia (4), Canada (19: British Columbia, Newfoundland, Quebec, Québec), China (23), Estonia (16), Iran (1), Kazakhstan (2), Malaysia (2), Mexico (11), Norway (4), the Russian Federation (19), South Korea (3), Sweden (6), United States (24: Minnesota, Nevada, New Mexico, New York, Oklahoma, Virginia, Wyoming)
• Skullrockian of United States (1: Texas)
• Taoyuanian of China (1)
• Cambrian to Ordovician of Canada (1: Quebec), Norway (2), the Russian Federation (2)
• Cambrian of Australia (2), Canada (27: Alberta, British Columbia, Newfoundland and Labrador, Nunavut, Nunuvat), China (40), New Zealand (2), Norway (3), the Russian Federation (4), South Korea (8), Sweden (3), the United Kingdom (1), United States (18: New Mexico, New York, Vermont, Virginia)
Total: 278 collections including 568 occurrences