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, Enantiognathus, Euconodonta, Euconodonta, Fahraeosodus, Falcodus, Gagievodus, Gobduntaulepis, Heterdontoides, Hindeodella andrusovi, Iowagnathus, Llandoverygnathus, Lundodus, Minimodus, Nasusgnathus, Noixodontus, Omanognathus, Oslodus, Ozarkodinida, Palmatodella, Panderodontida, Pandorinella, Paraconodontida, Parvigondolella, Polygnathida, Polyplacognathida, Prioniodontida, Protopanderodontida, Pseudobelodella, Rexroadus, Rhynchognathodus, Rotundoconus, Sagittodontus, Scandodus, 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)
• Arenigian of United States (1: Alaska)
• Arenig of Argentina (2), China (3)
• Ordovician of Argentina (7), Australia (4), Canada (10: British Columbia, Newfoundland, Quebec, Québec), China (18), Estonia (17), Kazakhstan (1), Malaysia (2), Norway (4), the Russian Federation (3), Sweden (5), United States (20: Minnesota, New Mexico, New York, Oklahoma, Virginia, Wyoming)
• Tremadoc of Argentina (4), Canada (9: British Columbia), China (5), Iran (1), Kazakhstan (1), Mexico (11), Norway (1), the Russian Federation (14), South Korea (3), Sweden (1), United States (4: Nevada, Virginia)
• Skullrockian of United States (1: Texas)
• Taoyuanian of China (1)
• Cambrian to Ordovician of Canada (1: Quebec), the Russian Federation (1)
• Cambrian of Australia (2), Canada (27: Alberta, British Columbia, Newfoundland and Labrador, Nunavut, Nunuvat), China (40), New Zealand (2), Norway (4), the Russian Federation (2), South Korea (8), Sweden (3), the United Kingdom (1), United States (18: New Mexico, New York, Vermont, Virginia)
Total: 273 collections including 555 occurrences