<==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 (kehrääjälinnut)
       |  |?-o †Archaeotrogon [Archaeotrogonidae]
       |  |  |-- †A. venustus
       |  |  |-- †A. zitteli
       |  |  |-- †A. cayluxensis
       |  |  `-- †A. hoffstetteri
       |  |-- Steatornithidae (rasvalinnut) [paraphyletic??]
       |  |-- Aegothelidae (australiankehrääjät)
       |  `--+-- Caprimulgidae (kehrääjät)
       |     |-- Nyctibiidae (pökkelökehrääjät)
       |     `--o "Podargidae traditionalis"
       |        |-- Podargidae (pöllökehrääjät)
       |        `-- Batrachostomidae [subfamily of Podargidae??]
       `--o APODIFORMES (kirskulinnut)
          |--o TROCHILI (kolibrit)
          |  `-- Trochilidae (kolibrit)
          `--o APODI (kirskujat)
             |--o †Jungornithidae
             |  |-- †Argornis caucasicus
             |  `--+?- †Jungornis tesselatus
             |     `-- †Palescyvus escampensis
             |--o †Aegialornithidae
             |  |-- †Primapus lacki
             |  |-- †Cypselavus gallicus
             |  `--o †Aegialornis
             |     |-- †A. szarskii
             |     |-- †A. gallicus
             |     |-- †A. leenhardti
             |     |-- †A. wetmorei
             |     `-- †A. broweri
             |--o Hemiprocne [Hemiprocnidae] (puukiitäjät, -kirskujat)
             |  |-- H. coronata (Crested Treeswift)
             |  |-- H. longipennis (töyhtökiitäjä)
             |  |-- H. mystacea (isopuukiitäjä)
             |  `-- H. comata (pikkupuukiitäjä)
             `-- Apodidae (kirskujat)



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.