Test truncated pyriform, widest at the base where it is fixed by a short stalk, truncated at the apical end where there is a definite, free, lip-like border; circular in cross section. Three or four corrugations at the widest part of the base. Body oval or spherical fastened to the base of the test, usually protruding from the test but not completely filling it. Tentacles slightly knobbed, numerous, scattered over the protruding surface of the body. Macronucleus central, oval; micronucleus not observed. One, two or three contractile vacuoles, requiring 12-20 minutes at 22° C. for a complete cycle.
Proceedings of the Iowa Academy of Science
©1931 Iowa Academy of Science, Inc.
King, Robert L.
"Two New Infusoria (Protozoa) from Iowa,"
Proceedings of the Iowa Academy of Science, 38(1), 241-243.
Available at: https://scholarworks.uni.edu/pias/vol38/iss1/95