†class Protoconodonta Landing 1995 (arrow worm)
Parent taxon: Chaetognatha according to P. Y. Parkhaev and Y. Demidenko 2010
Sister taxa: Amiskwidae, Eognathacantha, Paucijaculum, Protoconodontida, Timorebestia, Titerina
Subtaxa: Mongolodus Protohertzina
Ecology: nektonic carnivore
Distribution:
• Solvan of the Russian Federation (4 collections)
• Amgan of the Russian Federation (4)
• Cambrian of Australia (1), Canada (4: Newfoundland and Labrador, Nova Scotia), China (83), India (3), Iran (2), Kazakhstan (15), Mongolia (3), the Russian Federation (10), the United Kingdom (2)
Total: 131 collections including 193 occurrences