Morphology and histology of the digestive system of raspberry weevil Aegorhinus superciliosus (Coleoptera: Curculionidae)

• Published in: Revista colombiana de entomología Vol. 39; no. 2; pp. 260 - 266
• Main Authors: Medel, Vivian, Molina, Benedicto, Seguel, Jorge, Rebolledo, Ramón, Quiroz, Andrés
• Format: Journal Article
• Language: Spanish
• Published: 01.07.2013
• Subjects: Coleoptera; Curculionidae
• ISSN: 0120-0488; 2665-4385
• DOI: 10.25100/socolen.v39i2.8248

A morphological and histological study was performed on the digestive system of Aegorhinus superciliosus (Coleoptera: Curculionidae), an important economic pest in southern Chile. This species has a typical digestive system for most insects, being similar in males and females, but longer in the latter, being twice the length of the insect. The digestive system is a long tube of variable diameter, divided into three regions: foregut, midgut and hindgut. From the histological point of view, it presents epithelium tissue features similar to the one described for other species, and externally it has a muscle tissue with no differences between males and females. Nevertheless, it shows features which differ either in other weevils or in beetles such as: absence of crop, the location and number of gastric caeca, presence of peritrophic membrane, and absence of a rectal pad.