Figure 7 in Proboscis sensory cells in Nemertea: comparative morphology and phylogenetic implications

Figure 7. Transmission electron micrographs of proboscidial monociliated sensory cells of pilidiophoran species. A, Lineus sanguineus, panoramic view showing the basal part of the glandular proboscis epithelium with sensory cells (asterisks). A high-magnification inset shows the contact between the axon of the sensory cell (asterisk) and the basiepithelial nerve plexus (np). B, Hubrechtella juliae, transverse section through a group of sensory cells (asterisks). Arrowhead points to axial rootlets. C, Hu. juliae, transverse section of the receptor process of a sensory cell. D, Hu. juliae, a transverse section of the proximal (black arrowhead) and distal (white arrowhead) regions of the receptor processes of sensory cells. E, Hu. juliae, a transverse section of the middle (black arrowhead) and distal (white arrowhead) regions of the receptor processes of sensory cells. F, Hu. juliae, a transverse section of a dendrite with fanned axial rootlets (arrowheads). G, Hu. juliae, high magnification of a longitudinal section of a dendrite. The filament bundles (white arrowhead) of the microvilli extend into