Male and female reproductive cycles were studied in 4 species of kinosternid turtles (Kinosternon subrubrum hippocrepis, K. f. flavescens, Sternotherus odoratus, and S. carinatus) collected from Arkansas, Texas, and Oklahoma. Spermatogenesis begins in June and reaches a peak by mid-August when the testes attain maximum size. Testicular regression begins shortly after the cessation of spermatogenesis. Follicular growth began during late summer but did not reach its peak until the following spring just prior to ovulation. Egg-laying is usually from May to early June. Regression of corpora lutea is complete in about 3 months. There was no correlation between body size and egg clutch size or testes weight.
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Mahmoud et al. (1972) studied this question.
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