Twenty-one species of Dytiscinae were collected in Wisconsin over the past 30 years, including three species of Acilius, one species of Cybister, eight species of Dytiscus, five species of Graphoderus, two species of Hydaticus, and two species of Thermonectus. Species keys are provided for adults, and except for Dytiscus and Cybister, keys are also provided for larvae. Based on a study of 13,236 adults and 854 larvae, information on the distribution and abundance of each species in Wisconsin is provided along with notes on their habitat, life cycle, and identification.
Hilsenhoff, William L.
"Dytiscidae and Noteridae of Wisconsin (Coleoptera). II. Distribution, Habitat, Life Cycle, and Identification of Species of Dytiscinae,"
The Great Lakes Entomologist, vol 26
Available at: https://scholar.valpo.edu/tgle/vol26/iss1/5