Atrophaneura horishana, the aurora swallowtail, is a species of butterfly from the family Papilionidae that is found in Taiwan.
The wingspan is 110âÂÂ130 mm. The wings are black. The body has red hairs. There is a large red patch on the underside of each hindwing. The wing veins are bordered in white.
Adults visit flowers. The eggs are yellow and spherical. The larvae have prominent tubercles, a whitish black ground colour and two white bands on the third and fourth abdominal segments. The larvae feed on species of Aristolochia - A. shimadai and A. liukiuensis. It is in general found at 1000âÂÂ2500 m in elevation and is only abundant in primary forests.
Common, but status should be monitored.
Has been ranked as a subspecies of Atrophaneura nox.