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Diogenornis
''Diogenornis fragilis'' is an extinct ratite that lived during the Paleocene. It was described in 1983 by Brazilian scientist Herculano Marcos Ferraz de Alvarenga.〔Alvarenga, H.M.F. (1983) Uma ave ratitae do Paleoceno Brasileiro: bacia calcária de Itaboraí, Estado do Rio de Janeiro, Brasil. ''Boletim do Museu Nacional, Nova Série, Geologia'' 41: 1–8〕 The type species is ''D. fragilis''. While initially considered a member of the family Opisthodactylidae, further examination of the fossil remains showed that it was very similar to the modern Rhea, except for a narrower beak and larger wings. According to Gerald Mayr, ''Diogenornis'' is best considered a stem-group member of the Rheidae.〔Mayr, G. (2009). Paleogene fossil birds. Springer.〕 It grew to about two thirds the size of the modern greater rhea.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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