folding in maniraptoran theropod dinosaurs The asymmetry of the carpal joint and the evolution of wing
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Supplementary data tml http://rspb.royalsocietypublishing.org/content/suppl/2010/02/24/rspb.2009.2281.DC1.h "Data Supplement" References http://rspb.royalsocietypublishing.org/content/277/1690/2027.full.html#ref-list-1 This article cites 27 articles, 4 of which can be accessed free Subject collections (2356 articles) evolution (148 articles) palaeontology Articles on similar topics can be found in the following collections
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The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs.
In extant birds, the hand is permanently abducted towards the ulna, and the wrist joint can bend extensively in this direction to fold the wing when not in use. Anatomically, this asymmetric mobility of the wrist results from the wedge-like shape of one carpal bone, the radiale, and from the well-developed convexity of the trochlea at the proximal end of the carpometacarpus. Among the theropod ...
متن کاملHomologies and homeotic transformation of the theropod ‘semilunate' carpal
The homology of the 'semilunate' carpal, an important structure linking non-avian and avian dinosaurs, has been controversial. Here we describe the morphology of some theropod wrists, demonstrating that the 'semilunate' carpal is not formed by the same carpal elements in all theropods possessing this feature and that the involvement of the lateralmost distal carpal in forming the 'semilunate' c...
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Historically, ecomorphological inferences regarding theropod (i.e. 'predatory') dinosaurs were guided by an assumption that they were singularly hypercarnivorous. A recent plethora of maniraptoran discoveries has produced evidence challenging this notion. Here, we report on a new species of maniraptoran theropod, Nothronychus graffami sp. nov. Relative completeness of this specimen permits a ph...
متن کاملAvian-like breathing mechanics in maniraptoran dinosaurs.
In 1868 Thomas Huxley first proposed that dinosaurs were the direct ancestors of birds and subsequent analyses have identified a suite of 'avian' characteristics in theropod dinosaurs. Ossified uncinate processes are found in most species of extant birds and also occur in extinct non-avian maniraptoran dinosaurs. Their presence in these dinosaurs represents another morphological character linki...
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Our understanding of coelurosaurian evolution, particularly of bird origins, has been greatly improved, mainly due to numerous recently discovered fossils worldwide. Nearly all these discoveries are referable to the previously known coelurosaurian subgroups. Here, we report a new theropod, Fukuivenator paradoxus, gen. et sp. nov., based on a nearly complete specimen from the Lower Cretaceous Ki...
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