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Ephemeroptera: Heptageniidae of Gunnison County, Colorado

Epeorus grandis

(McDunnough) 1924
Updated 25 Jan 2012
TSN 100635


Mayflies of the US states E. grandis is present in the county. Watch for a dark or blackish Epeorus larvae with gills that are purple underneath and a row of setae on their abdominal terga (top or ventral side of their abdomen). See the photos from Troutnut.com below.

Good Links

On this website:
Introduction to Epeorus

Other Websites:
Photos - from Troutnut.com

Photos, Map, Museum specimens, DNA - Barcodinglife.org


Gilpin,BR and Brusven,MA 1970 Food habits and ecology of mayflies of the St. Maries River in Idaho. Melanderia 4:19-40. PDF

McCafferty,WP; Durfee,RS; Kondratieff,BC 1993 Colorado mayflies (Ephemeroptera): an annotated inventory. Southwestern Naturalist 38 3, 252-274. PDF
     Discussed as Ironopsis grandis Quote from page 261: "The first author has seen specimens from Idaho, Washington, and Wyoming. This species was therefore to be expected in Colorado. It is suprising that the disctinctive larvae of this species had not been reported before in any of the state ecological studies, and it may be that populations are very isolated, such as those of the Black Hills, South Dakota (McCafferty, 1990). "

McCafferty,WP and Provonsha, AV The Mayflies of North AmericaSpecies List (Version 8Feb2011)
     Here is the geographic range and synonyms:
Epeorus grandis (McDunnough), 1924 [CAN:FN,NW;USA:FN,NW,SW]
    * Ironopsis grandis (McDunnough), 1924 (comb.)
    * Iron grandis McDunnough, 1924 (orig.)

McDunnough,J 1924 New Canadian Ephemeridae with notes, II. Canadian Entomologist 56, 90-98, 113-122, 128-133.
     Described as Iron grandis on page 130. Figure 1 is from page 91.

Brown,WS 2004 Mayflies (Ephemeroptera) of Gunnison County, Colorado, USA