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Table 2 Description of the gametogenic stages of females and males

From: Growth, mortality, and reproduction of Tagelus plebeius (Bivalvia: Solecurtidae) in Southeast Brazil

Stage Brief description of gonad Figures
Female
 Early gametogenesis The connective tissue is abundant, the size of the follicles is small, and the initial stage of gametogenesis is present. Oocytes lie at the periphery of the gonadal walls and are attached to the basal membrane by a stalk 5a
 Late gametogenesis The size of the follicles increased and the initial stage of gametogenesis is still present, but restricted to the periphery of the follicles. Most mature oocytes are free in the lumina while some are still attached to the basal membrane by a thin stalk 5b
 Ripe The connective tissue has been reduced by the enlargement of the follicles by ripe gametes. The mature oocytes take polygonal shape due to packing. A decrease in the percentage of oogonia and pre-vitellogenic oocytes attached to the wall was also seen 5c
 Spawning Gametes are being released and empty spaces were observed in the follicular lumina 5d
 Spent The follicle lies empty with occasional residual oocytes present 5e
Male
 Gametogenesis The connective tissue is abundant, and the size of the follicles is small. Spermatocytes proliferate toward the lumina, and rows of germinal cells in phases of maturation (spermatogonias, spermatocytes, and spermatids) form a germinal layer near the gonadal wall 6a
 Ripe The connective tissue has been reduced by the enlargement of the follicles by ripe gametes. Lumina is packed with ripe spermatozoa. 6b
 Spawning Follicles showed a radial arrangement of the spermatozoa as they are being released 6c