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Fig. 3 | Helgoland Marine Research

Fig. 3

From: Comparative study of the female gametogenic cycle in three populations of Buccinanops globulosus (Caenogastropoda: Nassariidae) from Patagonia

Fig. 3

Buccinanops globulosus. Female gonad at different developmental stages. a Proliferation and Growth I: follicles with oogonia and pre-vitellogenic oocytes surrounded by companion cells. b Growth II: oocytes attached to the follicular membrane still in contact with companion cells and the cytoplasm charged by vitellogenic granules. c Pre-evacuation: cytoplasm of oocytes fully occupied by vitellum and reduction in the lumen space. d Evacuation: general aspect of the ovary with the presence of free large vitellogenic oocytes in the lumen of the follicles. e Detail of a follicle at the Evacuation stage; the presence of small oocytes in the follicular wall indicates the restarting of the growth process. f Post-evacuation: empty follicles lost their typical shape and showed only some gametogenic remains. cc companion cells, dg digestive gland, ef empty follicle, fm follicular membrane, gr vitellogenic granules, re gametogenic remains, lu lumen, n nucleus, nu nucleolus, og oogonia, po pre-vitellogenic oocite, vo vitellogenic oocite. Scale bars = 100 µm (a, b, f); 200 µm (c, e); 250 µm (d)

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