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The majority of the cross-sections of seminiferous tubules of nine-banded armadillos show only one type of cellular association as in most eutherian and metatherian mammals with scrotal testes. The spermatogenic cycle was divided into 8 stages, in relation to the shedding of the spermatozoa. The relative frequencies (%) of stages 1-8 were, respectively: 16.6, 7.5, 12.9, 9.1, 9.7, 18., 11.7 and 13.6. The duration of the cycle was 8.15 days, as determined by intratesticular injection of [3H]thymidine and removing the tissue at different times after injection.

Frequency and duration of the stages of the cycle of the seminiferous epithelium of the nine-banded armadillo (Dasypus novemcinctus)