Reproductive Cycle of Marphysa sanguinea (Montagu, 1815) (Polychaeta: Eunicidae) in the Lagoon of Tunis
Figure 4
Ovogenesis. (a) Histological section of a posterior segment of a female collected in March showing ovaries (arrowheads) containing primary oocytes (arrows), oogonia (Oo), free vitellogenic (VOc) and mature oocytes (MOc) in the coelom (Co). (b) Detail of an ovary from an individual collected in May. The ovary consists of a germ-cell cluster surrounded by a thin envelope of follicle cells (FC) (arrows) and is attached to a blood vessel (Bv). (c) Coelomic fluid (Co) from a female collected in August showing early vitellogenic oocytes (VOc) and numerous lipid droplets (L). (d) Coelomic fluid from a female collected in September showing vitellogenic oocytes. (e) Coelomic fluid from a female collected in December showing mature oocytes. (f) Detail of a mature oocyte from a female collected in January. The arrow indicates the gradient of distribution of the vitellus. N: nucleus; PVOc: previtellogenic oocyte; S: germinal sac.
