Consulta: creatorFacets:"Corwin Sullivan"
Registros recuperados: 3
Data/hora: 09/06/2024 10:26:26

Reply to &amp;#x201c;Limusaurus and bird digit identity&amp;#x201d;
Provedor de dados: Nature Precedings
Autores: Xing Xu; James Clark; Jonah  Choiniere; David Hone; Corwin Sullivan.
Vargas et al. agree with us that a lateral shift in theropod dinosaur digits occurred prior to the origin of birds, but contend that it occurred as a single &amp;#x201c;frameshift&amp;#x201d; with little outward change to the three main digits involved^1^.  We consider the digital morphology of Limusaurus, other ceratosaurs, and non-avian tetanurans to provide evidence that the shift was stepwise, and that a stepwise shift better explains theropod manual morphology than a hidden frameshift.
Tipo: Manuscript
Palavras-chave: Evolutionary Biology.
Ano: 2011
URL: http://precedings.nature.com/documents/6375/version/1

Comment on &amp;#x22;Embryological evidence identifies wing digits in birds as digits 1, 2, and 3.&amp;#x22;
Provedor de dados: Nature Precedings
Autores: Xing Xu; Jonah  Choiniere; Corwin Sullivan; Fenglu Han.
Tamura et al. (Science, 11 Febuary 2011, p. 753) claim that the three avian wing digits should be identified as digits I-III based on new embryological data and suggest that these identifications help to remove the conflict between the paleontological data and developmental data concerning the homology of the avian digits. However, their results are not novel, and the authors fail to address the critical problems relating to this interesting issue.
Tipo: Manuscript
Palavras-chave: Evolutionary Biology.
Ano: 2011
URL: http://precedings.nature.com/documents/6433/version/1

A bizarre Jurassic maniraptoran from China with elongate ribbon-like feathers
Provedor de dados: Nature Precedings
Autores: Fucheng Zhang; Zhonghe Zhou; Xing Xu; Xiaolin Wang; Corwin Sullivan.
Recent coelurosaurian discoveries have greatly enriched our knowledge of the dinosaur-bird transition, but all reported taxa close to this transition are from relatively well-known coelurosaurian groups^1-3^. Here we report a new basal avialan, Epidexipteryx hui gen. et sp. nov., from the Middle-Late Jurassic of Inner Mongolia, China. This new species is characterized by an unexpected combination of characters seen in several different theropod groups, particularly the Oviraptorosauria. Phylogenetic analysis shows it to be the sister taxon to Epidendrosaurus^4,5^, forming a new clade at the base of Avialae^6^. Epidexipteryx also possesses two pairs of elongate ribbon-like tail feathers (ETFs), and its limbs lack contour feathers for flight. This finding...
Tipo: Manuscript
Palavras-chave: Developmental Biology; Ecology; Earth &amp; Environment.
Ano: 2008
URL: http://precedings.nature.com/documents/2326/version/1