Data on life histories and environmental requirements for species in many mayfly genera remains sketchy at best This is certainly true of Baetis, which is one of the most common components of Wisconsin's lotic fauna. Most Wisconsin streams that are not grossly pobted contain one or more species of the minnow-like nymphs, which are usually found clinging to surfaces of rocks or aquatic plants. Biological studies of Baetis in North America have been neglected primarily because of their enigmatic taxonomy. Even keys of Needham et al. (1935) and Burks (1953), which are considered standard referenas, are either incomplete or difficult to use when identifying Baetis.
Bergman, Edward A. and Hilsenhoff, William L.
"Baetis (Ephemeroptera: Baetidae) of Wisconsin,"
The Great Lakes Entomologist, vol 11
Available at: https://scholar.valpo.edu/tgle/vol11/iss3/1