This order is represented by a single family, Phoenicopteridae (flamingos).
References/Literature
Frias-Soler RC, Bauer A, Grohme MA, López GE, Costa MG,
Llanes-Quevedo A, Van Slobbe F, Frohme M, and Wink M (2022), Phylogeny of the order Phoenicopteriformes and population genetics of the Carribean flamingo (Phoenicopterus
ruber: Aves), Zool. J. Linn. Soc. e:zlac040. (pdf)
Mayr G (2004), Morphological evidence for a sister group
relationship between flamingos (Aves: Phoenicopteridae) and grebes (Podicipedidae), Zool. J. Linn. Soc. 140, (pdf)
Torres CR, Ogawa LM, Gillingham MAF, Ferrari B, and van Tuinen
M (2014), A multi-locus inference of the evolutionary diversification of extant flamingos (Phoenicopteridae), BMC Evol. Biol. 14, e:36. (pdf)