Histomorphology of the Alimentary tract of adult, Odoiporus longicollis (oliv.) (Coleoptera: Curculionidae)

The banana pseudostem borer Odoiporus longicollis (Oliv.) is the most serious pest of banana plantation in Manipur. The present study on the anatomy and histomorphology of alimentary tract of adult weevil is one of the striking scientific aspects as the stage has to propagate the pests race. The digestive tract is tubular and coiled structure having 39-42mm in length measuring almost double the length of the body (measuring 18-22mm long). The tract is divisible into Stomodaeum or foregut measuring 9-11 mm. in length, Mesenteron or Midgut is 20-22 mm in length and Proctodaeum or Hindgut measuring 10-11mm in length. These parts are well demarcated by the presence of distinct grooves. Stomodaeum has pharynx, oesophagus, crop and stomodaeum valve having the histological layers like lumen,inner intimal layer, outer intimal, epithelium, basement membrane, musculatures; Mesenteron possees anterior voluminous, middle tubular and posterior with regenerative crypts with histological layers of lumen, peritrophic membrane, epithelium, basement membrane and the last proctodaeum has pylorus, Ilium, Colon and rectum with histological layers namely lumen, intima, epithelium, basement membrane and muscularis repectively.