No gap in the Middle Permian record of terrestrial vertebrates
No gap in the Middle Permian record of terrestrial vertebrates
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DOI：
10.1130/g32669.1
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发表时间：
2012-04-01
期刊：
影响因子：
5.8
通讯作者：
Benton, Michael J.
中科院分区：
文献类型：
--
作者：
Benton, Michael J.
在二叠纪时期，四足动物经历了由前半期以基础突触动物为主的动物群向后半期以治疗类动物为主的动物群的重大转变。这一转变意义重大，因为它标志着更丰富、更复杂群落的开始，是现代陆地生态系统的先驱。这种转变可能是渐进的，也可能是突然的，但化石记录中假定出现了一个被称为“奥尔森间隙”的实质性中断，使这种转变的性质变得模糊，这使得对它的研究变得复杂。来自美国西南部和俄罗斯欧洲的主要四足动物单位的重新测定的新证据证实，二叠纪四足动物的化石记录没有空白。事实上，在整个二叠纪四足动物化石记录中存在大量抽样偏差的证据受到质疑。
During the Permian, tetrapods showed a major transition from basal synapsid-dominated faunas in the first half to therapsid-dominated faunas in the second. The transition was significant in marking the beginning of richer and more complex communities, a precursor to modern terrestrial ecosystems. This changeover may have been gradual or abrupt, but its study has been complicated by the postulated occurrence of a substantial hiatus in the fossil record, termed "Olson's Gap", which obscured the nature of the turnover. New evidence from redating of key tetrapod-bearing units of the American southwest and European Russia confirms that there is no gap in the fossil record of Permian tetrapods. Indeed, evidence for substantial sampling bias in the Permian tetrapod fossil record as a whole is queried.