The spermatogenesis of the species of Family: Terapontidae is less investigated, so that the present study is planned to gain more information about the spermatogenesis of one species of this family, Terapon puta, from Lake Timsah, Ismailia governorate, Egypt. Histologically, the testes of T. puta belong to the lobular unrestricted spermatogonial type and the spermatogenesis is of the cystic type. The spermatogenic cells are classified into six stages, namely: the spermatogonia A and B, primary and secondary spermatocytes, spermatids and spermatozoa. Moreover, the ultrastructural examination revealed that the spermatids are differentiated into three stages, namely: the early, mid and late stages. In addition, the spermatozoon of T. puta belongs to type I aquasperm which consists of three main regions; anacrosomal head, short middle piece and a single flagellum.
Key words: Anacrosomal spermatozoa, aquasperm, cystic spermatogenesis, lobular testis, unrestricted testis
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