| Ceylon tree nymph | |
|---|---|
| |
| Specimen collected by Robert Templeton | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Family: | Nymphalidae |
| Genus: | Idea |
| Species: | I. iasonia
|
| Binomial name | |
| Idea iasonia (Westwood, 1848)
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| Synonyms | |
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The Ceylon tree nymph (Idea iasonia) is a species of nymphalid butterfly in the subfamily Danainae. It is endemic to Sri Lanka. First described by John Westwood 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 IUCN Red List.
- ^ Lepidoptera Specialist Group (1996). "Idea iasonia". IUCN Red List of Threatened Species. 1996: e.T10782A3215644. doi:10.2305/IUCN.UK.1996.RLTS.T10782A3215644.en. Retrieved 16 November 2021.