Subfamily Heptageniinae Needham 1901 (stream mayfly)
Insecta - Ephemeroptera - Heptageniidae
Full reference: J. G. Needham. 1901. Ephemeridae. Aquatic Insects in the Adirondacks. New York State Museum Buletin 47:418-429
Parent taxon: Heptageniidae according to X. M. Yang et al. 2023
See also Wang and McCafferty 2004
Sister taxa: Amerogenia, Cruscolli, Ecdyonurinae, Electrogenia, Miocoenogenia, Pseudokageronia, Rhithrogeninae, Succinogenia
Subtaxa: Heptagenia Heptageniini Kageroniini Maccaffertium Stenonematini
Ecology:
Distribution:
• Miocene of China (4 collections), Mexico (1)
• Eocene of the Russian Federation (5)
Total: 10 collections including 12 occurrences