FIGURE 5 in Contribution to the morphological description of the marine leech, Ozobranchus margoi (Apáthy) (Rhynchobdellida: Ozobranchidae) by using combined histology, micro-CT and SEM

FIGURE 5. Histological transversal section of O. margoi. A, different stage of maturation of clusters of germ cells in the testes. Spermatogonia (sg) and spermatids (st) in each cluster are arranged around the cythophore (cy). In more advanced stages it is possible to observe the tails (t) and degenerating cytophores (asterisk). Scale bar = 100 µm. B, structure of the ovary. The ovisac (os) surround the ovary cord (oc) immersed in the ovary lumen (ol). Elongated follicular cells (fc) envelope the egg string that is composed by numerous immature germ cells (gc). The club-shaped end (cse) and a tiny convoluted central part of the cord are visible in this section. Scale bar = 100 µm. C, maturing oocytes (o) in proximity of nurse cells (nc). The germinal vesicle or nucleus (n) contains pale nucleoplasm (np) and nucleoli (nl). Scale bar = 50 µm.