The Louisiade whistler (Pachycephala collaris) is a species of bird in the family Pachycephalidae, which is endemic to the Louisiade Archipelago south-east of New Guinea. It was split from the Bismarck whistler by the IOC in 2015.
Taxonomy and systematics It has been variably considered a subspecies of a widespread golden whistler (P. pectoralis) or treated as a separate species, but strong published evidence in favour of either treatment is limited, and further study is warranted to resolve the complex taxonomic situation.Boles, W. E. (2007). Golden Whistler (Pachycephala pectoralis). pp. 421-423 in: del Hoyo, J.; Elliot, A. & Christie, D. eds (2007). Handbook of the Birds of the World. Volume 12: Picathartes to Tits and Chickadees. Lynx Edicions, Barcelona.
Subspecies Two subspecies are recognized: P. c. collaris - Ramsay, 1878: Found in the Louisiade Archipelago except Rossel Island P. c. rosseliana - Hartert, 1898: Originally described as a separate species. Found on Rossel Island (Louisiade Archipelago)
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