Bug FAQOrange Cahill
Stenacron interpunctatum · Order: Ephemeroptera · Family: Heptageniidae
Also called: Light Cahill
The orange cahill, Stenacron interpunctatum, is a flat-headed mayfly in the family Heptageniidae. It lives in North America. Its larvae feed on detritus and are usually found under stones in streams.
Source: Wikipedia
How to recognize it
Stenacron interpunctatum is a species of flat-headed mayfly in the Heptageniidae family.
Source: Wikipedia
Where it lives
The larvae live under stones where they feed on detritus.
Source: Wikipedia
What it eats
Larvae are detritivores, consuming organic debris.
Source: Wikipedia
Where it comes from
It is found in North America.
Source: Wikipedia
Where it is found in the US
Recorded in 35 of 51 states and DC. Most records: Illinois, Vermont, Ohio, Michigan, Kansas, Indiana, Minnesota, Wisconsin.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Stenacron_interpunctatum
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-23.