<==o "CAPRIMULGIMORPHAE"
   |--o CAPRIMULGIFORMES
   |  |?-o †Archaeotrogon [Archaeotrogonidae]
   |  |  |-- †A. venustus
   |  |  |-- †A. zitteli
   |  |  |-- †A. cayluxensis
   |  |  `-- †A. hoffstetteri
   |  |--o Steatornithidae (rasvalinnut) [paraphyletic]
   |  |  |--o †Preficinae
   |  |  |  |-- †Prefica nivea
   |  |  |  `--o †Paraprefica
   |  |  |     |-- †P. kelleri
   |  |  |     `-- †P. major
   |  |  `--o †Steatornithinae (nykyrasvalinnut)
   |  |     `--o Steatornis (rasvakehrääjät)
   |  |        |?- †S. sp.
   |  |        `-- S. caripensis	(rasvakehrääjä)
   |  |-- Aegothelidae (australiankehrääjät)
   |  `--+-- Nyctibiidae (pökkelökehrääjät)
   |     |-- Caprimulgidae (kehrääjät)
   |     `--+-- Podargidae (pöllökehrääjät)
   |       `-- Batrachostomidae
   `--o APODIFORMES
      |--o APODI
      |  |-- †Aegialornithidae
      |  |-- Apodidae (kirskujat)
      |  `-- Hemiprocnidae (puukirskujat)
      `--o TROCHILI
         `-- Trochilidae (kolibrit)


Reference(s):

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

–Harvard University Press, Cambridge, Massachusetts & London, England, 1980, IX-196
Feduccia, A., 1996: The Origin and Evolution of Birds.

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

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.

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

–Yale University Press, New Haven & London, 1990. xxiv-1111.