<==o Podicipedidae (uikut)
   |-- †Miobaptus walteri
   |--o Tachybaptus (pikkuuikut)
   |  |-- T. ruficollis (pikkuuikku)
   |  |-- T. novaehollandiae (australianuikku)
   |  |-- T. pelzelnii (madagaskarinuikku)
   |  |-- T. dominicus (kääpiöuikku)
   |  `-- T. rufolavatus (alaotrajärvenuikku)
   |-- †Pliolymbus baryosteus Murray, 1967
   |--o Podilymbus (kirjonokkauikut)
   |  |-- †P. mujusculus Murray, 1967
   |  |-- †P. wetmorei Storer, 1976
   |  |-- †P. gigas (guatemalanuikku)
   |  `--o P. podiceps (paksunokkauikku) [P. magnus]
   |     |-- †P. p. magnus [P. magnus] [Pleistocene] [synonymous to P. p. podiceps?]
   |     |-- P. p. podiceps (pohjoisamerikanpaksunokkauikku)
   |     `-- P. p. antarcticus (eteläamerikanpaksunokkauikku)
   |--o Poliocephalus ()?
   |  |-- P. poliocephalus (mustaniskauikku)
   |  `-- P. rufopectus (uudenseelanninuikku)
   |--o Rollandia (titicacanuikut)
   |  |-- R. microptera (titicacanuikku)
   |  `--o R. rolland (valkotöyhtöuikku)
   |     |-- R. r. chilensis (Chilean Grebe)
   |     `-- R. r. rolland (Falkland Grebe)
   |-- Aechmophorus clarkii (meksikonuikku)
   `--o Podiceps Latham [Pliodytes Brodkorb, 1953] (silkkiuikut)
      |-- †P. oligocaenus (Shufeldt)
      |-- †P. subparvus (Miller, L. & Bowman, 1958)
      |-- †P. parvus (Shufeldt)
      |-- †P. dixi Brodkorp, 1963
      |-- †P. discors Murray, 1967
      |-- P. major (isouikku)
      |-- P. grisegena (härkälintu)
      |-- P. cristatus (silkkiuikku)
      |--+?- †P. sociatus (Navás, 1922) [= Thiornis sociata??]
      |  `--+?- †P. sp. aff. P. auritus [+P. pisanus (Portis, 1888); +P. howardae Storer, 2001; +Pliodytes lanquisti Brodkorb, 1953]
      |     |-- P. auritus (mustakurkkuuikku)
      |     `-- P. nigricollis (mustakaulauikku)
      |-- P. andinus (Colombian Grebe)
      |-- P. taczanowskii (juninjärvenuikku)
      |-- P. gallardoi (huppu-uikku)
      `--o P. occipitalis (hopeauikku)
         |-- P. o. juninensis (Junin Grebe) [P. taczanowskii??]
         `-- P. o. occipitalis (Silvery Grebe)


Reference(s):

Feduccia, A., 1980: The Age of Birds.

–Harvard University Press, Cambridge, Massachusetts & London, England, 1980, IX-196
Feduccia, A., 1997: The Origin and Evolution of Birds.

–Yale University Press, New Haven, 1996, x-420

Olson, S. L., 1975: Paleornithology of St. Helena Island, South Atlantic Ocean.

–Smithsonian Contributions to Baleobiology: Vol. 23, pp. iv-49

Olson, S. L., 1985: The fossil record of birds. 79-239.

in Farner, D., King, J. & Parkes, K. (eds.), 1985: Avian Biology. vol VIII.

–Academic Press, New York. 1985.

Olson, S. L. & Rasmussen, P. D., 2001: Miocene and Pliocene birds from the Lee Creek Mine, North Carolina. 233-365

in Ray, C. E. & Bohaska, D. J., (eds.) 2001: Geology and paleontology of the Lee Creek Mine, North Carolina, III.

–Smithsonian Contributions to Paleobiology: Nr. 90, iii-365

Sibley, C. G. & Monroe, B, L., 1990: Distribution and taxonomy of birds of the world.

–Yale University Press, New Haven & London, 1990. xxiv-1111.
    Storer, R. W:, 1976: The Pleistocene pied-billed grabes (Aves: Podicipedidae). 147-153
In Olson, S. L. (ed.), 1976: Collected papers in avian phylogeny
honoring the 90th birthdayof Alaxander Wetmore.
--Smithsonian Contributions to Paleobiology: No. 27, xxvi-211

    Storer, R. W., 2001: A new Pliocene grabe from the Lee Creek Mine. 227-231
in Ray, C. E. & Bohaska, D. J., (eds.) 2001:
Geology and paleontology of the Lee Creek Mine, North Carolina, III.
--Smithsonian Contributions to Paleobiology: No. 90, iii-365