Fig. 5

Maja brachydactyla. Adults. Epithelium of the midgut caeca: epithelial cells. Epithelial cell, general diagram (A). Anterior midgut caecum, epithelial cell (B–C): supranuclear region (B), and infranuclear region (C). Posterior midgut caeca, epithelial cell, close view of different structures (D–F): cell-to-cell junction (D), rough endoplasmic reticulum, mitochondria, and Golgi complexes (E), and smooth endoplasmic reticulum, and mitochondria (F). Scale bars (nm): 500 (F); (μm): 1 (D–E), 2 (B–C). Abbreviations: asterisk, cell-to-cell junction; BC, basal cell; BF, basal folds; BL, basal lamina; EV, electron dense-vesicles (cytoplasm); GB, Golgi bodies; Mt, mitochondria; Mv, microvilli; N, nucleus; RER, rough endoplasmic reticulum; TS, tubular structures