FIGURE 3 in Contribution to the morphological description of the marine leech, Ozobranchus margoi (Apáthy) (Rhynchobdellida: Ozobranchidae) by using combined histology, micro-CT and SEM

FIGURE 3. Histological transversal section of O. margoi A, section of the anterior crop (ac) including the last part of the oesophagus (oe) and columns of gland cells (gc) ending in a gland duct (gd). Scale bar = 500 µm. B, section trough the female system exposing the vagina (v) with the set of duct of the seminal receptaculum (sr). Laterally two tiny ejaculatory ducts (ed) and the atrium (a) are shown. Scale bar = 500 µm. C, section of the dorsal part of the anterior sucker showing one of the two pigmented cup eyes with pigmented supportive cells (psc) and photoreceptor cells (phc). Scale bar = 50 µm. D, transversal section of the eye showing two photoreceptors. The apical part of those cells is composed by a vacuole-like structure (vls) located above a large cytoplasmic area containing the nucleus (n). Beside the nucleus nerve fibres (nf) are departing. Between the two eyes is visible the body cavity (cc). Scale bar = 50 µm. E, section of the ganglionic mass at the level of the supraesophageal ganglion (sg) surrounding the proboscis (pr). Around the ganglionic mass is visible the body cavity (cc). Scale bar = 200 µm. F, section along the oviducal bridge with the two tubular ovaries (ov) opening in two foramina (fac, fnc) for the passage of the alimentary canal (ac) and the nerve cord (nc). Down of the ovaries there are the two seminal vesicles (sv). Scale bar = 500 µm.