part of continuous with pupal spiracular tracheal branch 4 non-functional pupal spiracle non-functional pupal spiracle 4 fly_anatomy.ontology FBbt:00003001 Any non-functional pupal spiracle (FBbt:00002998) that is part of some tracheal metamere 4 (FBbt:00005029) and is connected to some pupal spiracular tracheal branch 4 (FBbt:00002979). tracheal metamere 4