impact of heavy metal zinc on histological changes in the testis of adult male odontopus varicornis (heteroptera: pyrrhocoridae) in relation to reproduction

The male reproductive system of Odontopus varicornis consists of a pair of testis, seminal vesicle, vas deferentia, a common ejaculatory duct and then into aedeagus. The testis showed some remarkable changes in the insects treated with heavy metal zinc (25 ppm median lethal concentration). The testis of treated insects showed the presence of a ruptured testicular follicle, disintegrated spermatocytes, pycnotic and necrotic spermatids. The toxicity impact of heavy metal zinc on Odontopus varicornis was appropriate to be comparatively higher than other insects.