Ultrastructure Of Midgut O F Third Instar Larvae Eristalis Megacephala (Diptera:Syrphidae)

Abstract

- The mid-gut of third instar larvae of Eristalis megacephala. was divided into anterior, middle and posterior mid-gut. The apical part of anterior mid-gut possessed long cylinder and compact microvilli .A large well developed nucleus was observed in the apical part of anterior mid-gut of the third instar larvae of Eristalis megacephala .Glycogen appears beneath microvilli in the apical part of the anterior mid-gut of third instar of Eristalis megacephala . Urate granule was observed beneath microvilli in the apical part of anterior mid-gut .The cytoplasm beneath the microvilli also contains large transparent secretory vacuoles, lipids spheres and numerous spherocrystals . The basal part of anterior mid-gut possessed thin basement membrane, a basal labyrinth with numerous mitochondria, dense vacuoles and multi vesicular bodies. Well-developed tracheae and muscle fibers also were observed in the basal part of anterior mid-gut of third instar larvae of Eristalis megacephala . The apical part of the middle mid-gut of third instar larvae of Eristalis megacephala possessed a well-developed cylinder and compact microvilli, large numerous vesicles supposed to be tyrosine vacuoles appear near to the microvilli of apical part of middle mid-gut of the third instar larvae of Eristalis megacephala. The basal part of middle mid-gut possessed thin basement membrane, a basal labyrinth with numerous mitochondria well developed trachea and muscle fibers also observed in the basal part of middle mid-gut of third instar larvae of Eristalis megacephala. The apical part of the posterior mid-gut possess long cylinder and compact microvilli glycogen appear beneath the microvilli in the apical part of posterior mid-gut of third instar larvae of Eristalis megacephala.The basal part of posterior mid-gut possess very thin basement membrane, basal labyrinth .