Ultrastructural observations on spermatogenesis within testes in Haemaphysalis longicornis (Acari: Ixodidae)
1997
Matsuo, T. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Mori, T. | Shiraishi, S.
A male tick gives elongated spermatids to a female, that is, spermatogenesis within tests completes itself until elongated spermatids. And then elongated spermatids develop into mature sperms after they enter into the female genital tract via the spermatophore. In the present study, ultrastructural observations of spermatogenic cells were made at each stage of spermatogenesis in male Haemaphysalis longicornis. Spermatogenic cells from spermatogonia to primary spermatocytes at the middle of their great growth phase were found in testes of unfed males. Subsequently, testes of H. longicornis are developed by feeding at their adult stage. The testes, or spermatogenic cells, were developed gradually until the 5-day feeding period was complete (the complete feeding stage). Spermatogenic cells at all stages from spermatogonia to elongated spermatids were contained in the testes of completely fed males. Spermatogenic cells were packed in cysts. Elongated spermatids which had been completed at the posterior ends of tests were made spermiation with the breakdown of the cyst cells. The spermatids were carried out of he tests through the central lumen. The cyst cells formed the lumen, and had some microvilli on their free surface
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