We examined seasonal reproductive patterns for the terrestrial isopod Hyloniscus riparius in Wisconsin. Samples collected from habitats in three Wisconsin regions were compared with regard to the reproductive status of population members. We also recorded differences in sex ratio and stage of female gravidity in all samples. Males were a minority in all samples. Southern samples showed the greatest reproductive capacity based on the proportion of females that were found to be gravid.
Jass, Joan and Klausmeier, Barbara
"The Terrestrial Isopod Hyloniscus Riparius (Isopoda: Oniscidea: Trichoniscidae) in Wisconsin,"
The Great Lakes Entomologist, vol 36
Available at: https://scholar.valpo.edu/tgle/vol36/iss1/11