Theropod locomotion
Theropod locomotion
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DOI：
10.1668/0003-1569(2000)040
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发表时间：
2000-09-01
期刊：
影响因子：
--
通讯作者：
Robinson, JM
中科院分区：
文献类型：
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作者：
Farlow, JO;Gatesy, SM;Robinson, JM
兽脚亚目（肉食性）恐龙涵盖了从鸡大小到大象大小的各种动物。这些恐龙的主要运动方式相当保守：兽脚亚目恐龙是直立、趾行、跨步的两足动物。即便如此，在兽脚亚目恐龙的进化过程中，臀部、尾巴和后肢的变化无疑影响了这些恐龙的行走和奔跑方式，这种趋势在鸟类的进化中达到了极致。一些衍生的非鸟类兽脚类恐龙发展出后肢比例，这表明它们比更原始的群体具有更大程度的粗略性。尽管如此，化石足迹并没有提供早期非鸟类兽脚亚目恐龙与后来的非鸟类兽脚亚目恐龙步幅变化的证据。然而，这些恐龙确实比双足鸟臀目恐龙或地面鸟类迈出相对更长的步幅——至少与足迹长度相比。从足迹证据来看，非鸟类兽脚亚目恐龙通常行走，很少使用更快的步态。最大的兽脚亚目恐龙可能不如它们较小的亲戚那么敏捷。
Theropod (carnivorous) dinosaurs spanned a range from chicken-sized to elephant-sized animals. The primary mode of locomotion in these dinosaurs was fairly conservative: Theropods were erect, digitigrade, striding bipeds, Even so, during theropod evolution there were changes in the hip, tail, and hindlinb that undoubtedly affected the way these dinosaurs walked and ran, a trend that reached its extreme in the evolution of birds. Some derived non-avian theropods developed hindlimb proportions that suggest a greater degree of cursoriality than in more primitive groups. Despite this, fossilized trackways provide no evidence for changes in stride lengths of early as opposed to later non-avian theropods. However, these dinosaurs did take relatively longer strides-at least compared with footprint length-than bipedal ornithischian dinosaurs or ground birds. Judging from trackway evidence, non-avian theropods usually walked, and seldom used faster gaits, The largest theropods were probably not as fleet as their smaller relatives.