The readaptation of Eocene sirenians to life in water
The readaptation of Eocene sirenians to life in water
复制标题
始新世海牛重新适应水中生活
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
D. Domning
中科院分区：
文献类型：
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作者：
D. Domning
始新世海兽和鲸类同时独立地进化出类似的形态适应水生生物。这些变化包括骶骨区域的灵活性增加、后肢减少和丧失、颈部缩短、骨骼质量增加和其他变化。后肢的丧失可能是由维持水平修剪的选择驱动的。短颈的优点在于更靠前的位置，因此，它使前肢操纵面的转动力矩更大。
Eocene sirenians and cetaceans simultaneously and independently evolved similar morphological adaptations to aquatic life. These included increased flexibility in the sacral region, reduction and loss of hind limbs, shortening of the neck, increased skeletal mass, and other modifications. Loss of hind limbs was probably driven by selection for the maintenance of horizontal trim. The advantage of a shorter neck lay in the more anterior position and consequently the greater turning moments of forelimb control surfaces that it made possible.