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A NEW ENANTIORNITHINE BIRD FROM THE LATE CRETACEOUS OF THE GOBI DESERT

机译:戈壁沙漠晚白垩世新的对映鸟氨酸鸟

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We report on a new species of enantiornithine bird from the Late Cretaceous of the Mongolian Gobi Desert, which adds to the meager record of birds from the latest part of the Mesozoic in this region. The exceptional, three-dimensional bones of the new fossil increase the known anatomical diversity of enantiornithine birds, providing information about previously unreported morphologies such as a pneumatised furcula. Several synapomorphies nest the new bird within an enantiornithine clade of proficient fliers, but the anatomy and proportions of its flight apparatus imply significant aerodynamic restrictions. The combination of phylogeny and our functional interpretation suggests that this new fossil bird is a representative of a flightless lineage. This discovery thus provides the first evidence of a trend towards more limited flying capabilities among Enantiornithes, a group of Cretaceous birds otherwise believed to be represented by competent fliers.
机译:我们报道了来自蒙古戈壁沙漠晚白垩世的一种新对映鸟氨酸鸟类,这增加了该地区中生代最新部分鸟类的微薄记录。新化石的特殊三维骨骼增加了对映鸟氨酸鸟类的已知解剖学多样性,从而提供了有关以前未报道的形态学信息,例如气化的睫毛。几种同形亚型将这只新鸟筑巢在熟练飞行物的对映鸟氨酸进化枝中,但是其飞行装置的解剖学和比例暗示了明显的空气动力学限制。系统发育和我们的功能解释相结合,表明这只新的化石鸟是不飞行谱系的代表。因此,这一发现提供了第一个证据,表明在Enantiornithes(一群白垩纪的鸟类,否则被认为是能干的飞行者)中飞行能力受到限制的趋势。

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