This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
J. del Hoyo, 2014 - HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines - (), 1-904 (book, English)
S. L. Olson, 2011 - A new genus and species of unusual tern (Aves: Laridae: Anoinae) from the Middle Miocene Calvert Formation of Virginia - Proceedings of the Biological Society of Washington (124), 270-279 (journal article, English)