Abstract
This paper is the first contribution of a series dealing with the life cycle of the bisexual rotifer Lecane inermis Bryce. The three types of individuals, the mictic females, the amictic females and the males, and the eggs from which they are derived, are described and their life histories are compared statistically. The individuals studied are intrinsically uniform members of the same genetic stock, cultivated under uniform environmental conditions, although they were not all contemporaneous. The comparison is based upon about 100 representatives of each type of individual.The three types of individuals are characteristically different in length of life. The mean length of life is, for the amictic females, 8.9 ± 0.11 days, for the mictic females, 11.1 ± 0.28 days, for the males, 5.7 ± 0.07 days. This difference is apparent in their life curves. Embryonic mortality is negligible in all three populations. Mortality increases gradually in the male population until the fourth day, then increases suddenly, 83...
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