Ephemeroptera: Baetidae of Gunnison County, ColoradoBaetis intermediusUpdated 12 Feb 2012
TSN 100810 Baetis intermedius is currently synonymized with Baetis tricaudatus LinksOn this website:Baetis bicaudatus Baetis Introduction ReferencesDodds,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. 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. " |