Based on the genetic analysis of García-R. and Trewick (2015) and the earlier papers by Sangster (1998) and Sangster et al. (1999), the Purple Swamphen, Porphyrio porphyrio has been split into 5 species:
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^García-R, J.C., and S.A. Trewick (2015), Dispersal and speciation in purple swamphens (Rallidae: Porphyrio), Auk 132, 140-155.
^Sangster, G. (1998), Purple Swamp-hen is a complex of species, Dutch Birding 20, 13-22.
^Sangster, G., C.J. Hazevoet, A.B. Van Den Berg, C.S. Roselaar, and R. Sluys (1999), Dutch Avifaunal List: Species Concepts, Taxonomic Instability, and Taxonomic Changes in 1977-1998, Ardea 87, 139-165.