The pink pigeon (N. mayeri) is its closest living relative, and together they form a lineage apart from both the typical pigeons (Columba) and the typical turtle doves (Streptopelia), slightly closer to the latter, if anything. Consequently, either these two are both placed in Streptopelia, or – as is probably the most accurate solution at present – separated as Nesoenas. The present species was in former times sometimes placed in a monotypicgenusHomopelia. While this is not outright wrong, if the Rodrigues population is also placed in Homopelia and Nesoenas is considered distinct too, it would probably be considered oversplitting by modern authors.[2]
Cheke, Anthony S. (2005): Naming segregates from the Columba–Streptopelia pigeons following DNA studies on phylogeny. Bull. B.O.C.125(4): 293–295. PDF fulltext
Johnson, Kevin P.; de Kort, Selvino; Dinwoodey, Karen, Mateman, A. C.; ten Cate, Carel; Lessells, C. M. & Clayton, Dale H. (2001): A molecular phylogeny of the dove genera Streptopelia and Columba. Auk118(4): 874–887. DOI:10.1642/0004-8038(2001)118[0874:AMPOTD]2.0.CO;2 PDF fulltext