IMPACT OF HEAVY METAL ZINCON THE HISTOLOGICAL CHANGES IN THE SEMINAL VESICLE OF THE ADULT MALE LACCOTREPHES RUBER (LINN.) (HETEROPTERA: NEPIDAE) IN RELATION TO REPRODUCTION

摘要

The male reproductive system of Laccotrephes ruber consists of a pair of testis, seminal vesicle, vas deferentia, a common ejaculatory duct and then into aedeagus. The seminal vesicle is bulged tubule shape structure. The seminal vesicle showed some marked changes in the insects treated with heavy metal zinc (25 ppm median lethal concentration). In treated insects shows a highly disintegrated epithelial cells with weakly stained cytoplasm and nuclei with many cytoplasmic vacuoles.