Luehdorfia japonica (female)
 
The Japanese luehdorfia (Luehdorfia japonica) is a species of butterfly in the subfamily Parnassiinae of Papilionidae. It is found only in Japan. It was discovered by Yasushi Nawa in Japan's Gifu Prefecture in 1883.It is also known as the Gifu butterfly.
Luehdorfia japonica is univoltine with adult emergence in early spring. The larval host plants are wild gingers species of the genus Asarum. Female butterflies lay eggs in clusters on the fresh growth of the host plant, and the hatched larvae feed on the leaf in groups during the early instar stages.
Japanese entomologists have intensively studied the phylogeography, population dynamics and other aspects of the biology of Luehdorfia japonica including the role of the sphragis. This is a post-copulatory plug, attached to the abdomen of the female after copulation preventing her from mating again. It is found in other Parnassinae and some Acraeini. Although the papilionid butterfly Luehdorfia japonica, usually lays eggs on new leaves of the host plant (Asarum sp.; Aristolochiaceae), eggs of the butterfly were frequently found on old leaves of Asarum megacalyx in Suyama, Tokamachi, Niigata prefecture. Larvae hatched on new leaves and those hatched on old leaves did not show significant differences in their survival rate in the field. In laboratory breeding, about 90% of larvae that were fed old leaves survived and developed normally to the pupal stage. Their growth rate, however, was slightly lower than those that were fed new leaves. No nutritional differences were found between the old and new leaves. The reason why oviposition on the old leaves was so frequent and why larvae that hatched on old leaves could survive in the study area is discussed.