Troides helena

Common birdwing
Male, dorsal side, at Manado, North Sulawesi
CITES Appendix II (CITES)
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Papilionidae
Genus: Troides
Species: T. helena
Binomial name
Troides helena
(Linnaeus, 1758)
Subspecies

17, see text

Troides helena, the common birdwing, is a butterfly belonging to the family Papilionidae. It is often found in the wildlife trade due to its popularity with butterfly collectors. The butterfly has seventeen subspecies.[1]

Description

For terms see External morphology of Lepidoptera.

The description of the commonest subspecies of the butterfly in India, T. h. cerberus Felder, is given below:[2]

Male

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 forewing 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 (sprinkled) 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.

Female

Upper and under sides of the female is similar to those in the male, but with the following differences:

Common birdwing (সোনাল), Kolkata, West Bengal, India
Common birdwing (সোনাল), Kolkata, West Bengal, India

Subspecies

Illustration of males and females

Distribution and status

T. helena is widely distributed and locally common in forest areas. Globally it is found in Nepal, India, Bangladesh, Myanmar, peninsular and eastern Malaysia, Singapore, Indonesia, Laos, Kampuchea, Thailand, Vietnam, southern China including Hainan, and Hong Kong.[1] In the Indonesian archipelago, T. helena is found in Sumatra, Nias, Enggano, Java, Bawean, Kangean Islands, Bali, Lombok, Sumbawa, Great Natuna (Bunguran), Sulawesi, Butung, Tukangbesi, Kalimantan, and Brunei.[1]

In Hong Kong, T. 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). It is also found on Lantau Island and Hong Kong Island.[3]

In India the T. helena 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] The subspecies found in India are:[4]

The common birdwing, though widespread and common in many of the localities in which it occurs, was classified as vulnerable in 1985.[1]

Etymology

Helen in Greek mythology Helen was the daughter of Zeus. Cerberus or Kerberos, in Greek and Roman mythology, is a multi-headed hound which guards the gates of the Underworld.

Conservation

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 species.[1]

Food plants

Illustration including larva and pupa of Troides helena

The larval food plants include Aristolochia indica, Aristolochia tagala and Bragantia wallichi. A food plant 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]

Troides helena is a member of the helena species group. The members of this clade are:

See also

Cited references

  1. 1 2 3 4 5 6 Collins, N. Mark; Morris, Michael G. (1985). Threatened Swallowtail Butterflies of the World: The IUCN Red Data Book. Gland & Cambridge: IUCN. ISBN 978-2-88032-603-6.
  2. ↑ Bingham, C.T. (1907). The Fauna of British India, Including Ceylon and Burma. II (1st ed.). London: Taylor and Francis, Ltd.
  3. 1 2 3 Hong Kong Lepidopterists' Society webpage on Common Birdwing. Accessed 12 October 2006.
  4. ↑ Cotton, Adam; Fric, Zdenek Faltynek; Smith, Colin & Smetacek, Peter (March 2013). "Subspecies catalogue of the butterflies of India (Papilionidae): A Synopsis". Bionotes. 15 (1): 5–8.

References

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