One or two extinct species are known: the Kanaka pigeon was a large species from New Caledonia and Tonga. It is only known by subfossil remains and was probably hunted to extinction by the early settlers. The spotted green pigeon, another extinct species from an unknown locality, has only a slight similarity to the Nicobar pigeon due to its neck feathers. Ornithologists place it in this genus, but there is not a unanimous agreement. One surviving specimen exists in the Liverpool Museum.
Taxonomy
The genus Caloenas was introduced by the English zoologist George Robert Gray in 1840 to accommodate the Nicobar pigeon.[1][2] The genus name combines the Ancient Greekkalos meaning "beautiful" with oinas meaning "dove".[3]
^Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 85. ISBN978-1-4081-2501-4.
^Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (2020). "Pigeons". IOC World Bird List Version 10.1. International Ornithologists' Union. Retrieved 22 March 2020.
Steadman, David William (2006). Extinction and Biogeography of Tropical Pacific Birds. University of Chicago Press. ISBN0-226-77142-3.