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Biol Bull 73: 280-294. (October 1937)
© 1937 Marine Biological Laboratory
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SEXUAL AND ASEXUAL REPRODUCTION IN EUPLANARIA TIGRINA (GIRARD)

ROMAN KENK 1

1 From the Miller School of Biology, University of Virginia, and the Department of Zoölogy, University of Ljubljana, Yugoslavia

1. Euplanaria tigrina occurs in at least two physiological races which differ in the manner of reproduction: a sexual and an asexual race.

2. The asexual race, according to observations covering several years, reproduces exclusively by fission. Temperature and nutrition control the rate of fission but do not induce sexuality.

3. The sexual race periodically develops reproductive organs and lays cocoons. After the breeding period has ceased, the sex organs degenerate and fission may occur at high temperature. The individual animal can outlive several periods of sexual activity.

4. In nature, all planarians that have alternating (sexual and asexual) reproduction, appear to propagate sexually during the colder season and asexually during the warmer season of the year.






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Copyright © 1937 by the Marine Biological Laboratory.