Figure 4 in Proboscis sensory cells in Nemertea: comparative morphology and phylogenetic implications

Figure 4. Transmission electron micrographs of proboscis monociliated (A–P) and multiciliated (Q–S) sensory cells of hoplonemerteans. A, Tortus tokmakovae, transverse section of the receptor process of a sensory cell. B, Nipponnemertes cf. bimaculata, transverse section of the receptor process of a sensory cell. C, Drepanophoridae gen. sp. 37, transverse section through the base of the receptor process of a sensory cell. D, Drepanophoridae gen. sp. 37, transverse section of the receptor process of a sensory cell. E, Drepanophoridae gen. sp. 27, transverse section of the receptor process of a sensory cell. F, Pelagica gen. sp. 2, transverse section of the receptor process of a sensory cell. G, Pelagica gen. sp. 1, transverse section through the dendrites (asterisks) of sensory cells. White arrowheads point to axial rootlets; black arrowheads point to filament bundles of the microvilli extending into the dendrite. H, Pelagica gen. sp. 1, transverse section through the basis of the receptor process of a sensory cell. I, Pelagica gen. sp. 1, transverse section through the middle region of the receptor process of a sensory cell. J, Pelagica gen. sp. 1, transverse section through the apical region of the receptor process of a