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Male spermatogenesis stage of P. vlangalii. (A) Spermatogonia appeared in June (Stage I); (B) Spermatocytes appeared in August (Stage II); (C) Spermatids and sperm appeared in September (Stage III); (D)/(E) Sperms became abundant in October/November (Stage IV); (F) Abundant sperm before spermiation in May of the following year (Stage V).
