Figure 6. Transmission electron micrographs of proboscidial monociliated sensory cells of palaeonemertean species. A, Carinina yushini, longitudinal section through a group of sensory cells (asterisks). B, Carinina yushini, transverse section of the receptor process of a sensory cell. C, Carinina yushini, longitudinal section through the globular ciliary tip of a sensory cell. D, Carinina yushini, longitudinal section of a dendrite within the apicolateral junctions (black arrowheads) of a sensory cell. Bundles of microvillar filaments (white arrowheads) are terminated at the cytoplasmic membrane. E, Carinina yushini, transverse section of the proximal region of the dendrite of a sensory cell. Centrally located axial rootlets (asterisk) are surrounded by bundles of microvillar filaments (mf). F, Carinina yushini, transverse section of a distal region of the dendrite of a sensory cell. Arrowheads point to axial rootlets. G, Tubulanus punctatus, longitudinal section of a sensory cell with axial rootlets (white arrowheads). The filament bundles (black arrowheads) of the microvilli extending into the dendrite and terminating into the cytoplasmic membrane (back arrow) below apicolateral junctions