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
The wingspan is . The wings are dark brown or black. The lower half of the abdomen is yellow. It has white markings on the forewings and a red patch on each hindwing.
The larvae feed on Thottea and Aristolochia species.
Subspecies
- L. n. manasukkiti <small>(Cotton, Racheli and Sukhumalind, 2005) </small> - Ranong and southernmost Myanmar
- L. n. neptunus <small>(Guérin-Méneville, 1840)</small> - West Malaysia, southernmost Thailand
- L. n. creber <small> (van Eecke, 1914) </small> - Simeulue
- L. n. fehri <small> (Honrath, 1892) </small> - Nias
- L. n. lepida <small> (Hanafusa, 1994) </small> - Tanahmasa Island in the Batu Islands
- L. n. eminens <small>(Hanafusa, 1990)</small> - Sipora
- L. n. siborangitana <small>(Tsukada and Nishiyama, 1980)</small> - Northern Sumatra
- L. n. padanganus <small>(Rothschild, 1908)</small> - Western Sumatra
- L. n. doris <small>(Rothschild, 1908)</small> - Borneo
- L. n. dacasini <small>(Schröder, 1976)</small> - Palawan
- L. n. matbai <small>(Schröder & Treadaway, 1990)</small> - Tawi-Tawi
References