Claim: Papilio rumiko, when disturbed, reveal a red omesterium, a defensive organ found in all papilionid larvae.
Evidence: If disturbed further, it everts red osmeterium from behind the head. Third instars are 11–16 mm, fourth 16–30 mm and fifth instar 30–50 mm. The osmeterium is a defensive organ found in all papilionid larvae, in all stages.