Two nearly mature nymphs of Acanthametropus pecatonica were collected in June 1986 from the shifting sand bottom of the lower Wisconsin River. This is the first known collection of this species in the western Great Lakes region since the original collections of two nymphs by R. E. Richardson in 1926 and 1927.
Lillie, Richard A.; Schmude, Kurt L.; and Hilsenhoff, William L.
"Rediscovery of Acanthametropus Pecatonica in the Western Great Lakes Region (Ephemeroptera: Siphlonuridae),"
The Great Lakes Entomologist: Vol. 20
, Article 7.
Available at: http://scholar.valpo.edu/tgle/vol20/iss2/7