Fig. 4

Maja brachydactyla. Megalopae 10 days post–hatching. Epithelium of the midgut caeca. TEM. General diagram (A). Anterior midgut caeca (B–C): supranuclear region (B), and infranuclear region (C). Posterior midgut caecum (D–E): supranuclear region (D), and infranuclear region (E). Detailed view of the mitochondria and Golgi bodies (F–G): anterior midgut caeca (F), and posterior midgut caecum (G). Anterior midgut caeca, detailed view of the basal folds of the epithelial cells (H). Scale bars (nm): 200 (H), 500 (F–G); (μm): 1 (B–E). Abbreviations: asterisk, cell-to-cell junction; BF, basal folds; BL, basal lamina; EV, electron-dense vesicles (cytoplasm); GB, Golgi bodies; LV, lucent vesicles (cytoplasm); MB, multivesicular body; ML, multilamellar body; Mt, mitochondria; Mv, microvilli; My, myofibrils; N, nucleus; RER, rough endoplasmic reticulum