Figure 13 in Proboscis sensory cells in Nemertea: comparative morphology and phylogenetic implications

Figure 13. Phylogenetic tree of Nemertea with some synapomorphies and autapomorphies (rectangles) (phylogeny modified from Andrade et al., 2014; Kvist et al., 2015; Chernyshev and Polyakova, 2019) with schemas of the collar and ciliary apparatus of monociliated sensory cells. Synapomorphies and autapomorphies are indicated as follows: 1, 11–12 axial roots; 2, one ring of collar microvilli; 3, large and small sensory cells; large sensory cells with a very long collar; filament bundles of the microvilli terminating in axial rootlets; 4, ciliary apparatus with radially arranged axial rootlets; 5, one axial rootlet; apical cylinder; globular ciliary tip fully or partially covered by the microvillus collar; 6, one axial root is longer than the others and extends into the axon; the filament bundles of the microvilli extend deeply into the dendrite; 7, multiciliated sensory cells; 8, monociliated sensory cells are rare; nonciliated sensory cells. *inner microvilli in the case of receptor processes with a double ring of microvilli.