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• W4282946831 endingPage "1047" @default.
• W4282946831 startingPage "1015" @default.
• W4282946831 abstract "The Greater Rhea (Rhea americana, Rheidae) is a flightless paleognath with a wide geographical distribution in South America. The morphology of its shoulder girdle and wings are different from those of flying birds and some characteristics are similar to basal birds and paravian theropods. We present a detailed osteological, myological, and functional study of the shoulder and the wing of the Greater Rhea. Particular features of the anatomy of the pectoral girdle and wing of Rhea include the lack of triosseal canal, reduced origin area of the mm. pectoralis p. thoracica and supracoracoideus and the lack of a propatagium. The wing muscle mass is markedly reduced, reaching only 0.89% of total body mass (BM). Forelimb muscles mass values are low compared to those of flying birds and are congruent with the non-use of wings for active locomotion movements. R. americana does not flap the wings dorso-ventral as typical for flying birds, but predominantly in cranio-caudal direction, following a craniolateral to caudomedial abduction-adduction arc. When the wings are fully abducted, they are inverted L-shaped, with the inner surface caudally faced, and when the wings are folded against the body, they do not perform the complete automatic wing folding nor the circumduction of the manus, a movement performed by extant volant birds. This study complements our knowledge of the axial musculature of the flightless paleognaths and highlights the use of the Greater Rhea as a model, which may help understand the evolution of Palaeognathae, as well as the origin of flapping flight among paravian theropods." @default.
• W4282946831 created "2022-06-16" @default.
• W4282946831 creator A5000582813 @default.
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• W4282946831 date "2022-06-07" @default.
• W4282946831 modified "2023-10-07" @default.
• W4282946831 title "Wing osteology, myology, and function of <i>Rhea americana</i> (Aves, Rheidae)" @default.
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• W4282946831 doi "https://doi.org/10.1002/jmor.21486" @default.
• W4282946831 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35673834" @default.
• W4282946831 hasPublicationYear "2022" @default.
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