Pale Morning Dun

Ephemerella excrucians · Order: Ephemeroptera · Family: Ephemerellidae

Also called: lowlands spiny crawler mayfly

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Pale Morning Dun
Photo: iNaturalist user, CC0

The pale morning dun is a spiny crawler mayfly belonging to the family Ephemerellidae. It occurs throughout Canada and the continental United States.

Source: Wikipedia

How to recognize it

The pale morning dun is a spiny crawler mayfly in the family Ephemerellidae.

Source: Wikipedia

Where it is found in the US

Recorded in 26 of 51 states and DC. Most records: California, Colorado, North Carolina, Tennessee, Michigan, Vermont, Kansas, Maryland.

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

JFMAMJJASOND

Source: GBIF

Same family (Ephemerellidae)

Dark HendricksonDark HendricksonEphemerella subvariaWestern Green DrakeWestern Green DrakeDrunella doddsiSmall Western Green DrakeSmall Western Green DrakeDrunella coloradensis

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Ephemerella_excrucians

Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia

Text written 2026-10-26 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-26.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.