内投药
生物
进化生物学
克莱德
现存分类群
颅骨
大脑
大脑大小
动物
系统发育学
古生物学
神经科学
医学
基因
放射科
磁共振成像
中枢神经系统
生物化学
作者
Amy M. Balanoff,Mark A. Norell,Aneila V. C. Hogan,Gabe S. Bever
出处
期刊:Brain Behavior and Evolution
[S. Karger AG]
日期:2018-01-01
卷期号:91 (3): 125-135
被引量:10
摘要
Unraveling the origins of the character complexes diagnosing major crown clades is one of the greatest challenges in evolutionary biology. These origination events tend to optimize along extraordinarily long stem lineages where the comparative biology of extant lineages is relatively weak in its heuristic power. Here we add to a growing paleontological literature on the evolutionary origins of the modern avi an brain by describing the endocranial casts of two oviraptorosaur dinosaurs, Citipati osmolskae and Khaan mckennai. These fossil data confirm the antiquity of several avian features, including the expanded cerebrum. They also extend our appreciation of both the inherent variability in the brain-skull relationship along the avian stem and the dynamic nature of these crown characters in the earliest history of their expression.
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