A second Cretaceous ornithuromorph bird from the Changma Basin, Gansu Province, northwestern China

• Autorzy: You H.-L. , Atterholt J. , O'Connor J. K. , Harris J. D. , Lamanna M. C. , Li D.-Q.
• Języki publikacji: EN

Abstrakty

EN

Finely−bedded lacustrine deposits of the Aptian (Lower Cretaceous) Xiagou Formation exposed in the Changma Basin of Gansu Province, northwestern China, have yielded numerous fossil vertebrate remains, including approximately 100 avian specimens. Though the majority of these birds appear referable to the ornithuromorph Gansus yumenensis, a number of enantiornithine fossils have also been recovered. Here we report on a specimen consisting of a complete, three−dimensionally preserved sternum, furcula, and sternal ribs that represents a second ornithuromorph taxon from the Xiagou Formation at Changma. The fossil exhibits morphologies that distinguish it from all previously−known Xiagou birds and demonstrate that it represents a derived non−ornithurine member of Ornithuromorpha. Though it is morphologically distinct from the equivalent elements of all other described ornithuromorphs, the material is too incomplete to justify the erection of a new taxon. Nonetheless, it increases the taxonomic diversity of the Xiagou avifauna, thereby expanding our knowledge of Early Cretaceous avian diversity and evolution.

Słowa kluczowe

EN

Cretaceous; ornithuromorph bird; bird; Aves; Ornithuromorpha; Aptian; Early Cretaceous; paleontology; Changma basin; Gansu province; China

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2010
• Tom: 55
• Numer: 4
• Opis fizyczny: p.617-625,fig.,ref.

Twórcy

autor

You H.-L.

• Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, PR China

autor

Atterholt J.

• Department of Integrative Biology, University of California at Berkeley, 1101 Valley Life Sciences Building, Berkeley, California 94720, USA

autor

O'Connor J. K.

• The Dinosaur Institute, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
• Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, 142 Xizhimenwaidajie, Beijing 100044, PR China

autor

Harris J. D.

• Department of Physical Sciences, Dixie State College, 225 South 700 East, St.George, Utah 84770, USA

autor

Lamanna M. C.

• Section of Vertebrate Paleontology, Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, Pennsylvania 15213, USA

autor

Li D.-Q.

• Gansu Geological Museum, 6 Tuanjie Road, Chengguan District, Lanzhou, Gansu Province 730010, PR China

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