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Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Psittaciformes
Family: Halcyornithidae
Harrison & Walker, 1972

Halcyornithidae or Pseudasturidae is a family of fossil birds, possibly belonging to the order Psittaciformes (parrots and relatives).[1] Members of this family lived in the Eocene, around 55-48 millions years ago. Fossil remains are known from the Green River Formation in the United States and from the London Clay formation in the United Kingdom.[2][3] They were probably the sister group to the owl-like Messelasturidae.[4]



  1. ^ Ksepka, Clarke, Grande (2011). "Stem Parrots (Aves, Halcyornithidae) from the Green River Formation and a Combined Phylogeny of Pan-Psittaciformes". Journal of Paleontology. 85 (5): 835–852. doi:10.1666/10-108.1.CS1 maint: multiple names: authors list (link)
  2. ^ Mayr (2002). "On the osteology and phylogenetic affinities of the Pseudasturidae – Lower Eocene stem-group representatives of parrots (Aves, Psittaciformes)". Zoological Journal of the Linnean Society. 136 (5): 715–729. doi:10.1666/10-108.1.
  3. ^ Dyke, Gareth J.; Cooper, Joanne H. (2000). "A new psittaciform bird from the London Clay (Lower Eocene) of England". Palaeontology. 43 (2): 271–285. doi:10.1111/1475-4983.00126.
  4. ^ Mayr (2011). "Well-preserved new skeleton of the Middle Eocene Messelastur substantiates sister group relationship between Messelasturidae and Halcyornithidae (Aves, ?Pan-Psittaciformes)". Journal of Systematic Palaeontology. 9 (1): 159–171. doi:10.1080/14772019.2010.505252.
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