| Common Birdwing | |
|---|---|
| Male | |
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Family: | Papilionidae |
| Genus: | Troides |
| Species: | T. helena |
| Binomial name | |
| Troides helena (Linnaeus, 1758) |
|
The Common Birdwing, Troides helena (Linnaeus, 1758), is a beautiful and large butterfly belonging to the Swallowtail (Papilionidae family). It is often found in the wildlife trade due to its popularity with butterfly collectors. The butterfly has seventeen subspecies.[1]
Contents |
Upperside of forewings are rich velvety black with adnervular pale streaks on either side of the veins beyond the cell. The cilia is short, black, alternated with pale buffy white in the middle of the interspaces.
Hindwing: the abdominal fold, the apical half obliquely of interspace 1, the termen broadly, the base of the cell and the costal area up to and including the basal half of interspace 7 velvety black, the rest of the wing rich silky yellow; the veins prominently but narrowly black; the inner margin of the terminal black border produced inwards into prominent cone-shaped markings in the interspaces.
All specimens have one or more postdiscal black spots in the interspaces, but never a complete series; in interspace 2 and sometimes also in interspace 3 these spots coalesce with the cone-shaped projections of the terminal black border. Underneath the abdominal fold is a dense mass of buffy-white scented cottony pubescence. Underside similar, the adnervular pale streaks on the fore wing broader and more prominent.
Hindwing: dorsal margin broadly black, with an edging of long soft black hairs; interspace 1 with a large oval postdiscal and a terminal black spot; interspace 2 with the postdiscal black spot generally separate from the cone-shaped projection of the black terminal border; the apical and lateral margins of interspaces 2-6 pale yellow irrorated with black scales.
Antenna, head and thorax black, the collar narrowly crimson; abdomen yellow, shaded above with black; beneath: the thorax with a large lateral patch of crimson, the anal segment prominently buff-coloured.
Upper and under sides of the female is similar to those in the male, but with the following differences:
It is the largest butterfly to be found in India. It is widely distributed and locally common in forest areas.
It is found in Nepal, India, Bangladesh, Myanmar, peninsular and eastern Malaysia, Indonesia, Laos, Kampuchea, Thailand, Vietnam, southern China including Hainan, and Hong Kong.[1]
In India the butterfly is found in the North-East of the country including Sikkim, West Bengal and Orissa. It is also found in the Andaman and Nicobar Islands.[1]
In the Indonesian archipelago, the Common Birdwing is found in Sumatra, Nias, Enggano, Java, Bawean, Kangean Islands, Bali, Lombok, Sumbawa, Bunguran (Natuna), Sulawesi, Butung, Tukangbesi, Kalimantan and Brunei.[1]
In Hong Kong, Troides helena is at the northern limit of its range. It is not common in Hong Kong but it is observed that there are stable populations in three sites (the surrounding area of Po Lo Che (Sai Kung), Shan Liu Road (Tai Po) and Kadoorie Farm & Botanic Garden in the New Territories. The species is also found on Lantau Island and Hong Kong Island.[3]
In Thailand, the Troides helena can be found at Kaeng Bang Rachan at the source of the Wang Thong River.
The Common Birdwing, though widespread and common in many of the localities it occurs in, is classified as Vulnerable.[1]
This species is protected under Wild Animals Protection Ordinance Cap 170 in Hong Kong.[3]. The Common Birdwing is protected in Indonesia and may also require protection in peninsular Malaya also. It is listed in Appendix II of Convention on the International Trade in Endangered Species of Wild Flora and Fauna (CITES) as are all other Troides spp.[1]
The larval foodplants include Aristolochia indica, Aristolochia tagala and Bragantia wallichi. A foodplant for the species, Aristolochia tagala has been planted in the Kadoorie Farm and Shan Liu Road in Hong Kong to sustain a healthy population of the species.[3]