The taxon contains 6 species in one family, Phoenicopteridae. 

Traditional genus-level timetree of extant Phoenicopteridae including distribution data (Distribution code) according to Torres et al. (2014) and Frias-Soler et al. (2022). Divergence times follow Frias-Soler et al. (2022). Note that total (nuclear and mitochondrial) divergence times given by Torres et al. (2014) are considerably younger. 

Genus-level classification of extant Phoenicopteridae following AviList checklist v2025. (link) The number of subspecies is given in parentheses. 

References

Frias-Soler RC, Bauer A, Grohme MA, Espinosa Lopéz G, Gutiérrez Costa M, Llanes-Quevedo A, Van Slobbe F, Frohme M, and Wink M (2022), Phylogeny of the order Phoenicopteriformes and population genetics of Caribbean flamingo (Phoenicopterus ruber: Aves), Zool. J. Linn. Soc. 196, 1485-1504. (free 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. (free pdf)