Reproductive organ of blow fly,Chrysomya megacephala (diptera: Calliphoridae): Ultrastructural of testis

This work presents the ultrastructure of testis of the medically important blow fly,chrysomya megacephala (fabricius) (diptera: calliphoridae) using light microscopy and electron microscopy. reproductive organ of males was dissected to determine the testis in the pupal stage,3-day-old flies and 7-day-old flies and observed under scanning electron microscopy (sem) and transmission electron microscopy (tem). sem displayed a smooth surface which is occasionally penetrated by tracheoles. tem of the testis in the pupal stage presents the thick testis wall covering underdeveloped cells containing a variable size of an electron-dense globule. for the 3-day-old males,the testicular wall is formed by an external layer,a peritoneal sheath,a muscular layer,a basement membrane,and a follicular epithelium. follicular epithelium presented developing spermatozoa. regarding the 7-day-old males,development of spermatozoa is apparent,displaying nucleus,centriolar adjunct,axoneme,and mitochondrial derivatives,with the 9 + 9 + 2 microtubule pattern of axoneme. © 2011 kabkaew l. sukontason et al.