Timing and biogeography of the eutherian radiation: fossils and molecules compared
Timing and biogeography of the eutherian radiation: fossils and molecules compared
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DOI：
10.1016/s1055-7903(03)00034-4
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发表时间：
2003-08-01
影响因子：
4.1
通讯作者：
Archibald, JD
中科院分区：
文献类型：
--
作者：
Archibald, JD
Theria包括Eutheria和它的姐妹分类Metatheria。胎盘目包括现存的真兽类及其最近的共同祖先。最古老的真兽类距今已有 125 mya（百万年前）。分子研究将该起源定位于大约 130-185 mya。由于最早的真兽类遗骸非常稀少，因此无法根据化石证据反驳更古老的日期。根据分子，最早的超序进化枝（因此称为胎盘菌）范围为 64-104mya（中位数 84mya），类似于基于化石的 85-90mya。基于化石的总进化枝 Archonta、Ferungulata、Glires 和 Paenungulata 与基于分子的进化枝相似，但 Afrotheria 不是由化石预测的。化石和分子都识别现存 18 种胎盘目中的 16 种。化石将目的起源定为大约 65 米亚，一些分子研究也是如此，但其他研究表明序数多样化的历史可以追溯到 100 米亚。化石证据支持真兽亚纲（和后兽亚纲）和胎盘亚纲起源于劳亚大陆，尽管一些分子研究表明这两个类群起源于冈瓦纳大陆。 (C) 2003 年爱思唯尔科学（美国）。版权所有。
Theria includes Eutheria and its sister taxon Metatheria. Placentalia includes extant eutherians plus their most recent common ancestor. The oldest eutherian is from 125 mya (million years ago). Molecular studies place this origin at about 130-185 mya. Older dates cannot be refuted based on fossil evidence as earliest eutherian remains are scarce. Earliest superordinal clades (hence Placentalia) range from 64-104mya (median 84mya) based on molecules, similar to 85-90mya based on fossils. Superordinal clades Archonta, Ferungulata, Glires, and Paenungulata based on fossils are similar to molecularly based clades, except Afrotheria was not predicted by fossils. Both fossils and molecules recognize 16 of 18 extant placental orders. Fossils place the origins of orders around 65mya as do some molecular studies, but others suggest ordinal diversification as old as 100mya. Fossil evidence supports a Laurasian origin for Eutheria (and Metatheria) and Placentalia, although some molecular studies suggest a Gondwanan origin for both taxa. (C) 2003 Elsevier Science (USA). All rights reserved.