substage of developmental stage oogenesis stage S11 oogenesis stage S11b FlyBase_development_CV Oogenesis stage that begins when endochorion begins to form at the anterior pole, a process which includes the beginning of formation of the dorsal appendages. During this stage, the follicle cells secrete membranous vesicles that form irregular extracellular plaques. This stage ends when dying nurse cells form an anterior cap to the oocyte. Temporal ordering number - 10150. FBdv:00007003