Patagioenas is a genus of New Worldpigeons whose distinctness from the genus Columba was long disputed but ultimately confirmed. It is basal to the Columba-Streptopelia radiation with their ancestors diverging from that lineage likely over 8 million years ago. While the biogeographic pattern of this group suggests that the ancestors of typical pigeons and turtle-doves settled the Old World from the Americas, Patagioenas may also be the offspring of Old World pigeons that radiated into different genera later, given that the cuckoo-doves (Macropygia) of Southeast Asia also seem to be closely related.[1]
caribaea/band-tailed group (Chloroenas): Characterized by tails with terminal bands and iridescent neck; rows of low single coos. Apparently the most basal group.[1]
leucocephala group (Patagioenas sensu stricto): Characterized by iridescent neck and dark plumage, or white edged outer wing coverts, or scaly appearance; groups of triple coos with the first call in each drawn out except in speciosa
A fossil species (Curtis pigeon) initially placed in Chloroenas, Patagioenas micula (Early Pliocene of Curtis Ranch, USA) is known. A small member of this genus, it probably indeed belonged to the band-tailed group.
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
Mahler, Bettina & Tubaro, Pablo L. (2001). Relationship between song characters and morphology in New World pigeons. Biol. J. Linn. Soc.74(4): 533–539. doi:10.1006/bijl.2001.0596 (HTML abstract)
Further reading
Wikimedia Commons has media related to Patagioenas.