Cycle of the Seminiferous Epithelium in the Java Fruit Bat (Pteropus vampyrus) and the Japanese Lesser Horseshoe Bat (Rhinolophus cornutus)

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Abstract

The cycle of the seminiferous epithelium in the Java fruit bat, Pteropus vampyrus, and the Japanese lesser horseshoe bat, Rhinolophus cornutus, was investigated by light microscopy and the characteristics of spermiogenesis were compared between these two species. In the Java fruit bat, the cycle of the seminiferous epithelium was divided into 11 stages and developing spermatids were subdivided into 13 steps. While in the Japanese lesser horseshoe bat, the cycle of the seminiferous epithelium was divided into 10 stages and developing spermatids were subdivided into 13 steps. Excepting slight morphological differences, the characteristics of acrosomal formation in both species were almost similar with each other. In the Java fruit bat after stage VII, the acrosome gradually elongated, flattened and finally became scoop-like in shape. In the Japanese lesser horseshoe bat after stage VIII, the acrosome elongated, flattened and then slightly shortened. Before spermiation, the acrosome became long spatula-like in shape. The elongation and flattening of spermatids in these two species were similar to those in insectivores. The finding may reflect the fact that the order Chiroptera is phylogenetically close to the order Insectivora.

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Morigaki, T., Kurohmaru, M., Kanai, Y., Mukohyama, M., Hondo, E., Yamada, J., … Hayashi, Y. (2001). Cycle of the Seminiferous Epithelium in the Java Fruit Bat (Pteropus vampyrus) and the Japanese Lesser Horseshoe Bat (Rhinolophus cornutus). Journal of Veterinary Medical Science, 63(7), 773–779. https://doi.org/10.1292/jvms.63.773

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