Fig. 9

Phyllochaetopterus socialis. Cerebral eye, TEM; a) PSCs (psc) above group of PRC somata (prc), arrows point to basal extensions of PSCs containing bundles of intermediate filaments running between somata of PRCs, arrowheads: apices of PRCs; b) Basal processes of PSCs with densely arranged intermediate filaments (arrows) approaching ECM (ecm), c) Apical branching pattern of intermediate filaments entering microvillar bases; d) Soma of PRC sending dendritic process apically (arrows), PRC with a few pigment granules (arrowhead); e) PSC with apical microvilli (mv) and cilium (ci), arrow: PRC process; f) PSCs and two processes of PRCs (arrows), one of which with sensory cilium (sc); g) PRC process with apical depression and sensory microvilli (smv); h) Sensory cilium emerging from PRC. Abbreviations: bb basal body, ci cilium of PSC, cu cuticle, ecm ECM, if intermediate filaments, mu muscle fiber, mv microvillus, ne neurites, np nucleus of PSC, nr nucleus of PRC, pg pigment granule, prc PRC, psc PSC, sc sensory cilium, smv sensory microvillus, za zonula adherens