Losaria neptunus, the yellow-bodied club-tail or yellow club-tail, is a species of butterfly from the family Papilionidae that is found in Sumatra, south Burma, north Borneo and the Philippines[1] The wingspan is 100–120 mm (3.9–4.7 in).

The wings are dark brown or black.

It has white markings on the forewings and a red patch on each hindwing.

[2] The larvae feed on Thottea and Aristolochia species.

Media related to Atrophaneura neptunus at Wikimedia Commons This Papilionidae-related article is a stub.