【placentals】什么意思_英语placentals的翻译_音标_读音_用法_例句_在线翻译

placental
英 [pləˈsentl] 美 [pləˈsentl]

有胎盘类

公布中文名称：有胎盘类 英文名称：placentals 定义：三个臼齿、四个前臼齿、除P1外全部替换，前臼齿形态自前向后逐渐臼齿化等特征及生殖行为等有别于后兽类。现生真兽类分布于除南极外的各大洲。有人认为它是由现

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生物学

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n. mammals having a placenta; all mammals except monotremes and marsupials
同义词： placental mammal eutherian eutherian mammal
adj. pertaining to or having or occurring by means of a placenta
"all mammals except monotremes and marsupials are placental mammals"

以上来源于: WordNet

These features led the paleontologists to conclude that the animal was closer to living placentals on the mammalian family tree than to pouched marsupials, such as kangaroos.

这些部分的特征让古生物学家得以作出这样的结论：这种动物在哺乳动物谱系中，与有胎盘类的关系较与有袋类(如袋鼠)的关系更接近。

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The monotremes split off about 166m years ago and the marsupials parted company with the placentals 148m years ago.

ECONOMIST: Rewriting the history of the mammals
Today, 90% of all mammals, which include humans of course, are placentals.

BBC: Fossil redefines mammal history
Nothing much then happened for 50m years when, all of a sudden, the placentals (or, at least, those with surviving descendants) split into four so-called superorders.

ECONOMIST: Rewriting the history of the mammals

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