1. CONCLUSION: The dividing mode of spermatogonia in Taeniid cestodes is mitosis with cells unseparated.

2. 7 Objective To study the mutability of ultra sodium pyrosulfite intake on ultrastructure changes and spermatogonium mice testis.

3. Methods Sperm abnormality test, Chromosome aberration of spermatogonia and unscheduled DNA synthesis (UDS) test in male mouse reproductive cells were used in the study.