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Fig. 6 | Zoological Letters

Fig. 6

From: Ultrastructure of cerebral eyes in Oweniidae and Chaetopteridae (Annelida) – implications for the evolution of eyes in Annelida

Fig. 6

Owenia fusiformis. Cerebral eye, a) LM, semi-thin section, b-f) TEM; a) Eye (ey encircled, orange) above brain (br, encircled, yellow), eye not distinctly set off from surrounding tissues, brain traversed by processes of glial cells, visible as basal-apical dark strands; b) TEM overview of region similar to a; PSCs (psc) and PRCs (prc) intermingle and are hard to discriminate, pigment granules (pg) randomly distributed over the entire eye region. Nuclei of PSCs (np) situated above nuclei of PRCs (nr), note bundles of intermediate filaments (if) in PSCs, boxed areas indicate the position of magnifications in c, d, and e, c) magnification of uppermost box with centriole (ce) and basal body (bb); d) Enlargement of b with alternating PSCs (psc) and PRCs (prc), eye epithelium covered by irregular arranged sensory processes (smv), the boxed area indicates an enlarged area of f; e) Apex of PRC, f) Apex of PSC (psc) with accessory centriole (ce) and basal body (bb) of the small cilium, Arrows point to apical hemidesmosomes. Abbreviations: bb basal body, br brain, ce accessory centriole, cu cuticle, ecm ECM, ey eye, if intermediate filaments, np nucleus of PSC, nr nucleus of PRC, pg pigment granule, prc PRC, psc PSC, sc sensory cilium, smv sensory microvilli, za zonula adherens

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