Ultrastructural Variations in Lethocerus niloticum(Insecta: Hemipera) Cased by Pollution in Lake Mariut, Alexandria, Egypt

摘要

Water bugs, Lethocerus niloticum(Hemiptera: Belos- tomatidae), were collected from polluted and unpolluted areas of Lake Mariut to study ultrastructural alterations of different Organs as a response to mainly heavy metal water pollution in the Lake. Malpighian tubules are described by light, scanning, and Transmission electron microscopy. L. Niloticum has four Malpighian tubules floating in the hemolymph. Each tubule Opens separately into the hindgut, consisting of one type of epithelium cells, and is divided into four regions.