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For Insects, Spiders & Their Kin
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Family Baetidae - Small Minnow Mayflies

Mayfly nymph - Procloeon small mayfly - female Mayfly-4701 - Callibaetis pictus Callibaetis imago - Callibaetis - female Baetis flavistriga adult male - Baetis flavistriga - male mayfly - Callibaetis Newly Emerged Mayfly Mayfly - Callibaetis ferrugineus - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Ephemeroptera (Mayflies)
Family Baetidae (Small Minnow Mayflies)
Numbers
Neartica lists 18 North American genera.
Size
Usually less than 15 mm.
Remarks
"Peterson's Field Guide to Insects" (1) notes on p. 66 that the hindwings are sometimes lacking.
Print References
"Peterson's Field Guide to Insects" (1)
Internet References
University of Michigan has some info and pics of Callibaetis sp.
The USGS Northern Prairie Wildlife Research Center has distribution maps of many Baetidae species.
Works Cited
1.A Field Guide to Insects
By Richard E. White, Donald J. Borror, Roger Tory Peterson