Maccaffertium vicarium
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Ephemeroptera
- family: Heptageniidae
- genus: Maccaffertium
- species: Maccaffertium vicarium
Oakville
Ontario
CanadaCayuga Heights
East Ithaca
Ithaca
Northeast Ithaca
New YorkAsheville
Hillsborough
North CarolinaWalhalla
South CarolinaPearisburg
Virginia
United States