Early Cretaceous Enantiornithine Birds (Aves, Ornithothoraces) and Establishment of the Ornithuromorpha Morphological Type

New data on the taxonomic and morphological diversity of Early Cretaceous Enantiornithes are reviewed. A new hypothesis concerning the phylogenetic position of Pengornithidae is proposed. These birds traditionally treated as primitive enantiornithines may in fact be more closely related to Ornithuro...

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