The family Epistylidae includes those peritrichous ciliates with non-contractile stalks, either solitary or forming large colonies with dichotomous stalks; the individuals are cylindrical, inverted bell-shape, or ovoid. The organisms are attached to aquatic animals, and occasionally to plants. The most recent and complete key to this family is that of Kahl (1935). The majority of species described in this paper are found attached to the carapace and plastron of Chrysemys marginata bellii (Western Painted Turtle). These species may be found also on the Snapping Turtle, or, rarely, attached to some of the filamentous algae on these animals. Other hosts for members of this group at Okoboji are Chironomus larvae and Cyclops. The species found in this survey are members of two genera: Epistylus and Opercularia. They are distinguishable from each other by the presence of a collar around the peristome in the genus Epistylus and its absence in Opercularia.
Proceedings of the Iowa Academy of Science
©1941 Iowa Academy of Science, Inc.
Bishop, Everett L. Jr. and Jahn, Theodore L.
"Observation of Colonial Peritrichs (Ciliata; Protoza) of the Okoboji Region,"
Proceedings of the Iowa Academy of Science, 48(1), 417-421.
Available at: https://scholarworks.uni.edu/pias/vol48/iss1/113