Fig. 2 in Morpho-histological characterization of immature of the bioindicator midge Chironomus sancticaroli Strixino and Strixino (Diptera, Chironomidae)

Fig. 2. Micrographs of the foregut and gastric caeca region of immature Chironomus sancticaroli. (A) Cross-section of the esophagus with longitudinal folds formed by the epithelium (arrow) and the longitudinal muscle layer; (B) longitudinal section showing the oesophageal lining epithelium (arrow); (C) cross-sectional of the caecum of the larva, note the Cuénot cells (arrow), cells of the caecum (arrowhead) and esophagus; (D) the Cuénot cells are detailed; (E) in detail, cells of gastric caeca; (F) longitudinal section the region of the caecum showing the estomodeal valve. bb: brush border; cae: gastric caeca; cuc: Cuénot cells; ml: muscle layer; oe: esophagus; oec: esophagus cells; oei: esophagus invagination. Stain: Harris hematoxylin and eosin. Scale bar = 20 µm.