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Palaeognathae Look for this name in NCBI Wikipedia Animal Diversity Web
http://palaeo-electronica.org/content/fc-1 Benton et al. 2015
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Lithornis celetius comes from the Fort Union Formation (early Tiffanian) of Montana and Wyoming, USA (Houde, 1988). The Tiffanian is equivalent to the middle to late Paleocene, and dated as 60.2-56.8 Ma (Secord, 2008).
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The soft maximum constraint is the same as for Neognathae (node 54), equivalent to the age of the Niobrara Chalk Formation, dated as Santonian (86.3–83.6 Ma ± 0.5 Myr), and so 86.8 Ma. Various flightless birds have been noted from the Maastrichtian, but none is convincingly palaeognath.
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Lithornis celetius is a member of clade Lithornithidae, which is in turn a member of the Palaeognathae, on the basis of numerous morphological apomorphies (Houde and Olson, 1981; Houde, 1988; Mayr, 2005; Leonard et al., 2005).
Houde, P.W. 1988. Palaeognathous birds from the early Tertiary of the Northern Hemisphere. Publications of the Nuttall Ornithological Club, 22:1–148.
Leonard, L.M. Dyke, G.J., and Van Tuinen, M. 2005. A new specimen of the fossil palaeognath Lithornis from the Lower Eocene of Denmark. American Museum Novitates, 3491:1-11.
Houde, P.W. and Olson, S.L. 1981. Palaeognathous carinate birds from the Early Tertiary of North America. Science, 214:1236–1237.
Mayr, G. 2005. The Paleogene fossil record of birds in Europe. Biological Reviews, 80:515–542.
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