Mullin (1926) in an unpublished thesis has listed 20 species of leeches found in the Okoboji Region. During the summers of 1946 and 1947 the writer has found two additional species so that the list now includes the following.
Proceedings of the Iowa Academy of Science
©1948 Iowa Academy of Science, Inc.
Mathers, Carol Kenneth
"The Leeches of the Okoboji Region,"
Proceedings of the Iowa Academy of Science, 55(1), 397-425.
Available at: https://scholarworks.uni.edu/pias/vol55/iss1/60