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15 March 2019 A cryptic new species of bulbul from Borneo
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Abstract

Cream-vented Bulbul Pycnonotus simplex of Borneo was previously considered to be polymorphic in iris colour, having either red or white (creamy-yellow) irides. Mitochondrial DNA sequence comparisons, however, indicate that white- and red-eyed Bornean individuals are not closely related to one another. Instead, white-eyed birds are sister to Ashy-fronted Bulbul P. cinereifrons of Palawan Island, in the south-west Philippines, and red-eyed birds are sister to white-eyed P. simplex of the Thai-Malay Peninsula. Consequently, we elect to treat the white-eyed Bornean population as a distinct, previously overlooked species. In respect to plumage, white- and red-eyed individuals are almost identical, varying only slightly in the amount of yellow coloration in their feathers. The two taxa are sympatric at some localities, but white-eyed individuals are rarer and more consistently associated with mature forest than red-eyed birds.

© 2019 The Authors; This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Subir B. Shakya, Haw Chuan Lim, Robert G. Moyle, Mustafa Abdul Rahman, Maklarin Lakim, and Frederick H. Sheldon "A cryptic new species of bulbul from Borneo," Bulletin of the British Ornithologists’ Club 139(1), 46-55, (15 March 2019). https://doi.org/10.25226/bboc.v139i1.2019.a3
Received: 8 October 2018; Published: 15 March 2019
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