<==o "STRIGIMORPHAE"
    |--o STRIGIFORMES    
    |  |--o †Protostrigidae
    |  |  |-- †Minerva antiqua
    |  |  `-- †Eostrix vincenti
    |  `--+-- †Ogygoptynx wetmorei [Ogygoptyngidae]
    |     |?- †Palaeoglaux perrierensis [Palaeoglaugidae]
    |     |?-o †Sophiornithidae
    |     |  |-- †Sophiornis quercynus
    |     |  `-- †Strigogyps dubius
    |     `--+-- Strigidae (pöllöt)
    |        `-- Tytonidae (tornipöllöt)
    `--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.