OLDEST KNOWN EUTHERIAN STAPES AND A MARSUPIAL PETROSAL BONE FROM THE LATE CRETACEOUS OF NORTH-AMERICA
OLDEST KNOWN EUTHERIAN STAPES AND A MARSUPIAL PETROSAL BONE FROM THE LATE CRETACEOUS OF NORTH-AMERICA
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DOI：
10.1038/281669a0
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发表时间：
1979-01-01
期刊：
影响因子：
64.8
通讯作者：
ARCHIBALD, JD
中科院分区：
文献类型：
--
作者：
ARCHIBALD, JD
晚白垩世兽目哺乳动物的头骨遗骸在北美很少发现，通常仅限于孤立的岩骨。本文报道了已知最古老的一个晚白垩世真兽亚目动物的镫骨和岩骨化石。与晚白垩世有袋动物岩骨的比较进一步表明了哺乳动物（或至少是兽目）中耳祖先的几种特征状态的可能条件，也表明了现存真兽目和有袋动物中耳各个方面的古老性。
Cranial remains of Late Cretaceous therian mammals are rarely found in North America and are usually limited to isolated petrosal bones. The oldest known associated stapes and petrosal bone of a Late Cretaceous eutherian are reported here. Comparison with a Late Cretaceous marsupial petrosal bone gives a further indication of the probable condition of several character states of the ancestral mammalian (or at least therian) middle ear, and also indicates the antiquity of various aspects of the middle ear of extant eutherians and marsupials.