page_title: Ceylon tree nymph
section_title: Taxonomy
hierarchical_section_title: Ceylon tree nymph / Taxonomy
caption_attribution_description: John Obadiah Westwood
context_page_description: The Ceylon tree nymph 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.
context_section_description: The species was first described by English entomologist John O. Westwood in 1848, as Hestia iasonia. For several years it was considered to be only an island race of I. lynceus, a species found in eastern Asia. However the two species have differences in their wing shapes and in the male genitalia. It is of the genus Idea, and belongs to the subfamily Danainae of the family Nymphalidae. Its binomial name is Idea iasonia.
caption: John Westwood was the first to describe Idea iasonia
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