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<==o Ciconiiformes (storks; kattohaikarat) |?- †Xenerodiops mycter Rasmussen et al., 1987 [Xenerodiopidae] |?-o Scopus [Scopidae] (varjohaikarat; hammercops) | |-- †S. xenopus | `-- S. umbretta (varjohaikara; hammercop) |?- Ardeiidae (haikarat; herons) [possibly gruiforms] |?- Plataleidae [Threskiornithidae] (iibikset; ibises) [possibly charadriforms] `--+-- Vulturides (kondorinsukuiset; condor-like ciconiiforms) `-- "Ciconida" (kattohaikaransukuiset; stork-like ciconiiforms)
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
Lokki, J., Jännes, H. & Nikander, P. J., 1992: Otavan lintutieto.
–Kustannusosakeyhtiö Otava, Helsinki, Finland, 1992, pp. 1-440
Translated from: Perrins, C. o. (ed.), 1990: The Illustrated encyclopaedia of birds.
–Headline Book Publishing Plc., London, England, 1990
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.
Rasmussen, D. T., Olson, S. L. & Simons, E. L., 1987: Fossil birds from the Oligocene Jebel Quatrani Formation, Fayum Province, Egypt.
–Smithsonian Contributions to Paleobiology: No. 62, pp. iv-20
Sibley, C. G. & Monroe, B, L., 1990: Distribution and taxonomy of birds of the world.
–Yale University Press, New Haven & London, 1990. xxiv-1111.
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