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Ephemeroptera: Baetidae of Gunnison County, Colorado

Baetis intermedius

Updated 20 Dec 2020

TSN 100810

Baetis intermedius is currently synonymized with Baetis tricaudatus


On this website:
Baetis bicaudatus
Baetis Introduction


Dodds,GS 1923 Mayflies from Colorado: descriptions of certain species and notes on others. Transactions of American Entomological Society 69, 93-116. PDF

Dodds,GS; Hisaw,FL 1925 Ecological studies on aquatic insects. IV. Altitudinal range and zonation of mayflies, stoneflies and caddisflies in the Colorado Rockies. Ecology 6(4)380-390. PDF

Elmork,K; Saether,OR 1970 Distribution of invertebrates in a high mountain brook in the Colorado Rocky Mountains. University of Colorado Studies Series in Biology No 31.

Flecker,AS and Allan,JD 1988 Flight direction in some Rocky Mountain mayflies (Ephemeroptera), with observations of parasitism. Aquatic Insects 10(1):33-42. PDF

Jensen,SL 1966 The Mayflies of Idaho (Ephemeroptera). M.S. Thesis, University of Utah, Utah. 364 p.
     Quote from Page:116 " Dodds (1923) described this species from adults and nymphs collected in Colorado. Dodds (1923) and Edmunds (1952b) provide descriptions of the adults and nymphs.
Taxonomy and Biology: This species is closely related to B. bicaudatus Dodds, the males being distinguished by the shape of the turbinate portion of the compound eyes. According to Edmunds (1952b) the intercalary vein of the hind wings, which supposedly distinguishes B. intermedius from B. bicaudatus has been found to be present on one hind wing and absent on the other in the same specimen of B. intermedius.
Nymphs of this species have been reported by Edmunds (1952b) as occuring in small to moderate sized streams at elevations from 4,000 to 7,500 feet. Adults have been collected from April to October.
Distribution: Baetis intermedius is a boreal western North American species previously unreported from Idaho. "

Koch,BJ; Hall Jr,RO and Peckarsky,BL 2020 Nonconsumptive effects of Brook Trout predators reduce secondary production of mayfly prey. Freshwater Science, 39(3), pp.549-558.
     Discussed as Baetis B.

McCafferty,WP 2007 Two new species synonyms in North American Baetis Leach (Ephemeroptera: Baetidae). Proceedings of the Entomological Society of Washington 109(3):735-736. PDF

Brown,WS 2010 Ephemeroptera of Gunnison County, Colorado