Ephemeroptera: Heptageniidae of Gunnison County, Colorado
Epeorus albertae (McDunnough) 1924
Slate Cream Dun, Pale Evening Dun, Pink Lady
Updated 7 Dec 2011
On this website:
Introduction to Epeorus
Argyle,DW; Edmunds,GF 1962 Mayflies (Ephemeroptera) of the Curecanti Reservoir Basins Gunnison River, Colorado. University of Utah Anthropological Papers 59 8, 178-189.
Quote from page 185: "The nymphs were found clinging to the surface of rubble stones in riffle areas. They are generally distributed at lower elevations in the Colorado River system. These collections probably represent the upper limits of their altitudinal distribution in this particular part of the upper Colorado River basin."
Cain,DJ; Luoma,SN; Wallace,WG 2004 Linking metal bioaccumulation of aquatic insects to their distribution patterns in a mining-impacted river. Environmental Toxicology and Chemistry 23, 1463-1473.
Edmunds,GF and Allen,RK 1964 The Rocky Mountain species of Epeorus (Iron) Eaton (Ephemeroptera: Heptageniidae). Journal of the Kansas Entomological Society 37 4, 275-288. PDF
Edmunds,GF and Musser,GG 1960 The mayfly fauna of Green River in the Flaming Gorge Reservoir Basin Wyoming and Utah. University of Utah Anthropological Papers 48:111-123.
Gilpin,BR and Brusven,MA 1970 Food habits and ecology of mayflies of the St. Maries River in Idaho. Melanderia 4:19-40. PDF
Jensen,SL 1966 The Mayflies of Idaho (Ephemeroptera). M.S. Thesis, University of Utah, Utah. 364 p.
Quote from pages 165-167: "Mcdunnough (1924) described this species from a series of adults collected in Alberta. Edmunds and Allen (1964) provide descriptions of the adults and mature nymphs.
Taxonomy and Biology: Epeorus albertae is closely related to E. dulciana (McDunnough) and the adults of the two species are somewhat difficult to distinguish. They do, however, represent a distinct species group within the genus and are easily distinguished from all other species by characters given in the keys.
The nymps of this species have been collected in large, moderately flowing rivers (less commonly in streams) among rocks and gravel and at eleveations from 4000 to 7000 feet. Edmunds and Musser (1960), in their study of tributaries of the Green River in Wyoming and Utah, report that E. albertae is believed to gradually replace E. longimanus (Eaton) as the water temperatures become warmer at lower elevations. Evidently the nymphs of this species do not commonly occur in cold water temperatures.
Adults of this species have been collected swarming from two to three feet over riffles of rivers during early morning or evening direct sunlight. They have been collected during July and August.
Distribution: Epeorus albertae is a boreal western North American species previously unreported from Idaho. Edmunds and Allen (1964) report that this species is widely distributed in the inland mountains of western North America, but do not list any locality records.
Lehmkuhl,DM 1968 Observations on the life histories of four species of Epeorus in western Oregon (Ephemeroptera: Heptageniidae). Pan-Pacific Entomologist 44(2):129-137. PDF
McCafferty,WP; Durfee,RS; Kondratieff,BC 1993 Colorado mayflies (Ephemeroptera): an annotated inventory. Southwestern Naturalist 38 3, 252-274. PDF
Discussed as Iron albertae. Quote from page 260: "Edmunds and Musser (1960) and Ward and Berner (1980) indicated that this intermountain West species tends to replace other Iron species as waters become somewhat warmer at lower elevations."
McCafferty,WP and Provonsha, AV The Mayflies of North AmericaSpecies List (Version 8Feb2011)
Here is the geographic range and synonyms:
Epeorus albertae (McDunnough), 1924 [CAN:NE,NW;USA:FN,NW,SW]
* Iron albertae McDunnough, 1924 (orig.)
* Iron youngi Traver, 1935 (syn.)
McDunnough,J 1924 New Canadian Ephemeridae with notes, II. Canadian Entomologist 56, 90-98, 113-122, 128-133.
Described as Iron albertae on pages 130 and 131 with Figure 4 on page 114.
Ward,JV and Berner,L 1980 Abundance and altitudinal distribution of Ephemeroptera in a Rocky Mountain stream. In: Advances in Ephemeroptera Biology. Eds: Flannagan,JF; Marshall,KE Plenum, New York, 169-186.