substage of immediately preceded by developmental stage prepupal stage P4 prepupal stage P4(i) prepupal stage P4(ii) FBdv:00005348 Bubble is displaced to anterior end of the puparium, and pupa withdraws to the posterior end. Imaginal head sac is everted and the oral armature of the larva is expelled. Duration at 25 degrees C: approximately 12 minutes. (132-132.2 hours after egg laying; 12-12.2 hours after puparium formation). pupal stage P4(ii) FlyBase_development_CV moving bubble stage Temporal ordering number - 560.