Abstract
Summary A population of Chlorohydra viridissima has been reared in the laboratory per several montlis in order to follow its sexuality; a variability of sexual types has been noticed. In a new population brought from nature to the atory, numerical data obtained at beginning of sexual maturation (42%) were: 70 ♂, 143, 111♀, 6 protcrandrous , 2 proterogynous . hut later he end of sexuality period and after a great mortality), 9♂, 83, 30♀, roterandrous , 16 proterogynous . The specimens have been separated and furthermore followed with their Some of these, beginning again the' sexuality, have enabled us to state following phenotypes: ♂, ♀, simultaneous (with occurrence of light irandry and light proterogyny), consecutive (both sexes form successives in the life-eycle of the animals with precedence either of male or female l. This sexual-phenotypes variability has been framed to the hypothesis of enic sexuality, according to Montalenti-Bacci (1951).
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