Download or read book Taxonomy and Ecology of Stenonema Mayflies (Heptageniidae:Ephemeroptera) written by Philip A. Lewis and published by . This book was released on 1974 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual provides keys and descriptions for all North American species of Stenonema mayflies and consolidates information from the literature on their ecology, environmental requirements, and pollution tolerance. Accounts of each species include synonymy, nymphal description, collection records, and a distribution map. The 31 species described and keyed include three new species, four new synonyms, two resurrected species, and new combinations involving three additional species and subspecies. Twelve species and one subspecies are classified as intolerant of organic pollution, eight species as tolerant of mild pollution, and seven species and two subspecies as tolerant to moderate pollution.