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Biol Bull 51: 237-244. (October 1926)
© 1926 Marine Biological Laboratory
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LIFE CYCLE OF NASSULA ORNATA AND NASSULA ELEGANS: ARE THESE SPECIES VALID?

EDNA MCNALLY

1. Nassula ornata and Nassula elegans represent not two species, but two metabolic stages of a single species.

2. The well nourished phase, known as Nassula ornata, does not encyst. Lack of food, first, converts Nassula ornata into Nassula elegans, and, in time, drives the forms as Nassula elegans into encystment.

3. Binary fission occurs more frequently in the poorly fed forms (Nassula elegans) than in the well-nourished forms (Nassula ornata).

4. There is but one nucleus in this ciliate, there being no differentiation of the nuclear complex into micro- and macronuclei.

5. Conjugation involving this single nucleus takes place in stocks that have aged.






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Copyright © 1926 by the Marine Biological Laboratory.