A five year survey was made of the gastropods of Lake West Okoboji, Iowa. Only 11 species comprise the present fauna, a remnant of what was earlier in this century several times larger. These species are: Amnicola limosa (Say), Amnicola lustrica Pilsbry, Ferrissia rivularis (Say), Gyraulus parvus (Say), Helisoma trivolvis (Say), Lymnaea reftexa Say, Lymnaea obrussa Say, Menetus exacuous (Say), Physa gyrina Say, Physa sayii Tappan, and Valvata tricarinata (Say). These are now confined to areas less than 10 meters in depth with numbers of species and densities much greater in the bays than in the main body of the lake. Other pertinent ecological data are noted.
Proceedings of the Iowa Academy of Science
©1960 Iowa Academy of Science, Inc.
Bovbjerg, Richard V. and Ulmer, Martin J.
"An Ecological Catalog of the Lake Okoboji Gastropods,"
Proceedings of the Iowa Academy of Science, 67(1), 569-577.
Available at: https://scholarworks.uni.edu/pias/vol67/iss1/70