Tetrahymena [Paraglaucoma] rostrata (Kahl, 1926) Corliss, 1952 occurs commonly in litter and occasionally in soil. It has previously been recorded from moss. In nature it feeds on cytolyzed or moribund tissue, but feeds on bacteria and flagellates in the presence of peptone. It is a facultative parasite of enchytraeid worms which it infects through degenerate setal follicles. It may also infect accidentally injured worms. The ciliates are attracted by histolysis and by peptone. Resistant cysts are formed regularly in the absence of food and encystment appears to be accelerated by crowding. Excystment is readily obtained with hypotonic salt solution. Theront, trophont, tomont and tomite stages are recognizable in the life cycle. Conjugation has never been observed.
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J. D. Stout (1954) studied this question.
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