part of develops from male genital disc analia male analia fly_anatomy.ontology FBbt:00004825 UBERON:6004825 The entire set of external structures in the distal half of the male abdomen, i.e. segment 10, that makes up the anal apparatus (cerci and anus) (Rice et al., 2019). It develops from the male genital disc (Rice et al., 2019). male terminalia ventral ectoderm derivative