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Bruce M. Beehler, R. J. Swaby, Phylogeny and Biogeography of the Ptiloris riflebirds (Aves: Paradisaeidae), The Condor: Ornithological Applications, Volume 93, Issue 3, 1 August 1991, Pages 738–745, https://doi.org/10.2307/1368206
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Abstract
We performed a phylogenetic and biogeographic study of the riflebird genus Ptiloris (Paradisaeidae). Our analysis, which includes sonograms documenting intertaxonomic variation in male advertisement vocalizations and a reassessment of key morphological characters, indicates that (1) the genus includes two distinct clades (P. victoriae/paradiseus and the P. magnificus complex); (2) within the P. magnificus complex, the eastern Papuan form may constitute a heretofore unrecognized sibling species; and (3) the biogeography of Ptiloris provides additional confirming evidence that the Torres Strait has been of minor importance as a biogeographic barrier for Australo-Papuan rainforest birds.