SPERMATOGENESIS IN FASCIOLOPSIS BUSKI / 重庆医科大学学报

ABSTRACT

In this study the process of spermatogenesis of Fasciolopsis buski has been observed by using the air-drying method.The results show that F. buski has the same process of spermatogenesis as that of the other digeneans. After 3 times of mitotic divisions as well as first and second meiotic divisions the spermid atage(32-cell stage) is formed through the process of the primary spermatogonial stage (1-cell stage), secondary and tertiary spermatogonia (2 - and 4-cell stages), primary and secondary spermatocytes (8 - and 16-cell stages). The spermatid then matures into 32 spermatozoa.The metaphase of spermatogonia has 14 chromosomes, which appear as "X" and "-" shapes, the metaphase I has 7 bivalent chromosomes, which form 7co-shaped con-figurations, while the metaphase II has 7 haploid chromosomes, which appear as "X" and"-" shapes, Therfore, they can be differentiated easily.Compared our results with that of Liao et al (1987), there are some differences in the descriptions of chromosomes of the metaphase I and II of meiosis, and of the metaphase of spermatogonia. The reason may be that Liao et al (1987) did not differentiate the metaphase I and II of meiosis