<i>Paramecium sonneborni</i> n. sp., a New Member of the <i>Paramecium aurelia</i> Species‐Complex¹

Abstract

ABSTRACT. From an intermittent stream in College Station, Texas, a Paramecium was isolated that did not appear to belong to any recognized species. On the basis of nuclear and whole‐body morphology, it can be assigned to the Paramecium aurelia species‐complex, and it can be distinguished from other members of that complex on the basis of mating‐type reactivity and isoenzyme patterns. These characteristics are felt sufficient to justify a new species assignment. The new species has been named Paramecium sonneborni n. sp. in honor of the late Dr. Tracy M. Sonneborn of Indiana University.