Anatomical and Histological Structures of Male Reproductive System in Long-Horned Beetle <i>Isotomus speciosus</i> (Schneider, 1787) (Coleoptera: Cerambycidae): Light and Scanning Electron Microscopic Study

Abstract Isotomus speciosus is a polyphagous insect that damages coniferous and deciduous trees. There no study on the male reproductive system of I. although it an important pest. For this purpose, anatomy histology were investigated using light scanning electron microscopy. According to results obtained, consists pair testes (each with separate testis lobes), two pairs vasa efferentia, deferentia, ejaculatory duct, aedeagus, three accessory glands. Each lobe has about 65 follicles. Testis sperm development stages (growth, maturation, differentiation). connected vas deferens via efferens. are masses mature completely fill lumen deferens. The efferens cylindrical epithelium, cubic epithelium. then opens into aedeagus by duct. duct intima layer spines, monolayer muscle layer. In study, similarities differences in organs other coleopteran species revealed.