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Fig. 8 | Zoological Letters

Fig. 8

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

Fig. 8

Phyllochaetopterus socialis, cerebral eye, a, b) LM, semithin sections, c) TEM; a) Cross-section with the posterior part of prostomium (pro) lying above peristomium (per), eye situated in an invagination between pro- and peristomium (boxed and enlarged in b), epidermis rich in glandular cells, ring-like brain encircled; b) Enlargement of a, eye (ey, encircled by stippled line) with irregular and diffuse outline; c) Low power TEM micrograph of the section adjacent to b, the entire eye with PSCs (psc) and PRCs (prc), nuclei of PSCs (np) situated above somata of PRCs (nr), arrows point to processes of PSCs extending basally towards ECM. Abbreviations: br brain, cu cuticle, dbv dorsal blood vessel, ep epidermis, ey eye, g gut, gl glandular cell, if intermediate filaments, lbv lateral blood vessel, np nucleus of PSC, nr nucleus of PRC, per peristomium, pro prostomium, prc PRC, psc PSC

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