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larger than the male, and the males have narrower forewings than the females. The surface area of the Ceylon tree nymph's wings is relatively large when compared with its weight; this allows it to fly with little effort and stay aloft for long periods of time. Ceylon tree nymphs from the dry zone of the country are usually larger in size and lighter in colour than ones from the wet zone.
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and N. Manders dating from about 1900 describes the larva as "velvety black with four pairs of long filamentous tentacles" with each segment of its body marked with a pale yellow band. The record further mentions that it has twelve segments and that the sixth segment has a "large oval crimson spot".
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Since the Ceylon tree nymph requires very little effort to fly, its wing beats are very slow, so slow that the individual movements of each wing can be easily observed. Most of its time is spent flying and hovering in the high tree canopies. However, it descends to ground level to feed and to breed,
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The Ceylon tree nymph has a wingspan of 110–155 mm, making it the largest member of the family
Danaidae in Sri Lanka. Both its wings have similar patterns and colouration. The wings are of a translucent silvery-white colour. The forewings are almost twice as long as their width. The female is
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In the IUCN Red List, the Ceylon tree nymph is listed as lower risk/near threatened. The main threat faced by the Ceylon tree nymph is the destruction of its habitat. However, various direct steps have been taken for the conservation of this species. Several of its naturally occurring areas are
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in 1848, the Ceylon tree nymph can be found in both wet and dry zones of Sri Lanka. It is the largest member of the family
Danaidae in that country. It is listed as a near threatened species in the
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occurs at ground level and the male and female fly together for an hour or more before mating. The male releases
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to Sri Lanka. There are two populations of the Ceylon tree nymph. The smaller and darker variety is found in the
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of Sri Lanka from sea level to about 5,000 feet (1,500 m). They usually inhabit the sub-canopies of
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The early stages of life of the Ceylon tree nymph are not well recorded. One account by naturalists
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but does not rest on the ground. It usually rests on the ends of dead branches or twigs.
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The other variety, which is larger and lighter coloured, is found in the low country
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292:. For several years it was considered to be only an island race of
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513:. Butterflies & Dragonflies of Sri Lanka. Archived from
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398:protected areas, such as the forest reserve of
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511:"Ceylon Tree Nymph - Idea iasonia, Westwood"
444:10.2305/IUCN.UK.1996.RLTS.T10782A3215644.en
281:The species was first described by English
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637:, Sri Lanka Wild Life Information Database
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274:John Westwood was the first to describe
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377:to stimulate the female. These include
782:IUCN Red List near threatened species
419:Lepidoptera Specialist Group (1996).
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567:Bambaradeniya, Channa N. B. (2006).
430:IUCN Red List of Threatened Species
543:"Ceylon tree nymph (Idea iasonia)"
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476:. WHT Publications. p. 102.
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302:, and belongs to the subfamily
802:Taxa named by John O. Westwood
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797:Butterflies described in 1848
389:Its head and legs are black.
373:and other chemicals from its
345:lowland tropical rain forests
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472:d'Abrera, Bernard (1998).
474:The Butterflies of Ceylon
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78:Scientific classification
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792:Butterflies of Sri Lanka
545:. Arkive. Archived from
331:Distribution and habitat
570:The Fauna of Sri Lanka
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38:Specimen collected by
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254:. First described by
573:. IUCN. p. 54.
437:: e.T10782A3215644.
16:Species of butterfly
386:Lionel de Nicéville
48:Conservation status
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235:) is a species of
24:Ceylon tree nymph
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242:in the subfamily
229:Ceylon tree nymph
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599:. Retrieved
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288:in 1848, as
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187:Idea iasonia
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728:iNaturalist
450:16 November
322:Description
308:Nymphalidae
145:Nymphalidae
135:Lepidoptera
776:Categories
601:2009-06-18
553:2009-06-18
521:2009-06-18
406:References
371:pheromones
295:I. lynceus
115:Arthropoda
400:Sinharaja
379:danaidone
358:Behaviour
252:Sri Lanka
240:butterfly
237:nymphalid
163:Species:
101:Kingdom:
95:Eukaryota
754:LepIndex
691:BioLib:
664:Wikidata
352:dry zone
341:wet zone
304:Danainae
266:Taxonomy
246:. It is
244:Danainae
204:Synonyms
195:Westwood
141:Family:
111:Phylum:
105:Animalia
91:Domain:
68:IUCN 2.3
720:5792081
670:Q914978
337:endemic
248:endemic
197:, 1848)
151:Genus:
131:Order:
125:Insecta
121:Class:
66: (
759:147624
733:103296
694:631014
679:ARKive
597:. IUCN
577:
480:
393:Threat
367:Mating
310:. Its
746:10782
707:953YX
741:IUCN
715:GBIF
626:Idea
575:ISBN
478:ISBN
452:2021
435:1996
300:Idea
227:The
156:Idea
702:CoL
439:doi
314:is
250:to
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
