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In memoriam Mary R. Dawson (1931–2020)

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Fostowicz-Frelik L., Lamanna M. C.

Acta Palaeontologica Polonica

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2021

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tom 66

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nr 1

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

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You H.-L., Atterholt J., O'Connor J. K., Harris J. D., Lamanna M. C., Li D.-Q.

Acta Palaeontologica Polonica

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2010

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tom 55

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nr 4

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.

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A partial skeleton of an enantiornithine bird from the Early Cretaceous of Northwestern China

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Lamanna M. C., You H.-L., Harris J. D., Chiappe L. M., Ji S.-A., Lu J.-C., Ji Q.

Acta Palaeontologica Polonica

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2006

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tom 51

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nr 3

Although recent discoveries from Lower Cretaceous sediments in northeastern China have greatly improved our understanding of the initial stages of avian diversification in eastern Asia, the early evolution of Aves elsewhere on the continent remains poorly understood. In 2004, a collaborative field effort directed by personnel from the Chinese Academy of Geological Sciences and Carnegie Museum of Natural History recovered multiple partial to nearly complete avian skeletons from outcrops of the Lower Cretaceous Xiagou Formation exposed in the Changma Basin of northwestern Gansu Province, China. Here we describe a thrush−sized partial skeleton comprised of a fragmentary pelvic girdle and largely complete hind limbs. A phylogenetic analysis of 20 avian ingroup taxa and 169 anatomical characters places the specimen in Enantiornithes, and within that clade, in Euenantiornithes. When coupled with additional recent discoveries from the Changma Basin, the new skeleton improves our understanding of early avian evolution and diversification in central Asia.

Ograniczanie wyników

3 Acta Palaeontologica Polonica

3 Lamanna M. C.

2 Harris J. D.

2 You H.-L.

1 Atterholt J.

1 Chiappe L. M.

1 Fostowicz-Frelik L.

1 Ji Q.

1 Ji S.-A.

1 Li D.-Q.

1 Lu J.-C.

1 O'Connor J. K.

1 2021

1 2010

1 2006

In memoriam Mary R. Dawson (1931–2020)

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

A partial skeleton of an enantiornithine bird from the Early Cretaceous of Northwestern China