White-tailed iora
| Marshall's iora | |
|---|---|
 |
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| at Rann of Kutch | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Aegithinidae |
| Genus: | Aegithina |
| Species: | A. nigrolutea |
| Binomial name | |
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Aegithina nigrolutea (Marshall, 1876) |
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The white-tailed iora or Marshall's iora (Aegithina nigrolutea), is a songbird in the genus Aegithina found in parts of India and Sri Lanka.
The status of the species has been debated and has only recently been given full species status. Earlier suggestions have been that it was a clinal variant of the common iora Aegithina tiphia.
The diagnostic features of the species are the short wing and tail; white edging to tertials converging broadly at the tip, versus tertial tips black to only narrowly white in tiphia and a smaller and shorter bill than tiphia from any part of India. The vocalizations are also different. The species is best known from northwestern India, however only a few verified specimen records exist from southern India. It is now also known from Sri Lanka.
There are several races of the common iora that may appear similar to this species:
Specimens showing nigrolutea characters collected within the range of Aegithina tiphia may be variants of the latter; such specimens have been obtained from southern Bihar, West Bengal, Khandesh, Tamil Nadu and Mysore. Two adult specimens collected from Gwalior are intermediate between Aegithina tiphia humei and Aegithina nigrolutea and one specimen from Ceylon is intermediate between the latter and Aegithina tiphia multicolor. The status of Aegithina nigrolutea as a distinct species is not settled. It is a problem that presents a challenge to geneticists and field workers alike
Salim Ali collected a specimen in the Biligirirangan Hills which was commented upon by Hugh Whistler:
One of the Biligirirangan birds, male ,15 September 1934 from Satyamangala (2,000') and evidently by the softness of the skull and the narrow tail feathers an immature bird, could not be distinguished from A. nigrolutea as the central tail is washed with white. I cannot believe that this is really nigrolutea which has not been recorded from nearer than northern Khandesh and Sambalpur. It is evidently an interesting case of individual variation showing how nigrolutea had its origin.
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Wikipedia