Fig. 7

Bright-field TEM images of the epithelial cells of L. fortunei, showing transversal sections of the gill filament. a Epithelial cells of the frontal tract, displaying the nucleus [n], Golgi complex [g] and smooth reticulum [r]. b Cells at the margin of the frontal tract showing the laterofrontal cirri [lfc] and spherical vesicles [v] above the epithelium. c Cells of the lateral tract that bears the lateral cilia [lc]. Spherical vesicles are also present in between the lc. d Higher magnification image of the square in c showing vesicle possibly containing mucus, and the septate junction in detail [sj]. The outlined arrowheads in images (b-d) indicate septate junctions. The open arrowheads point out non-junctional regions of the cell membranes with increased space