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The Placental Mammal Ancestor and the Post–K-Pg Radiation of Placentals
Let There Be Mammals The timing of the evolution and radiation of placental mammals and their most recent common ancestor has long been debated, with many questions surrounding the relationships ofExpand
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Implications of Deltatheridium specimens for early marsupial history
We describe here two new specimens of the mammal Deltatheridium pretrituberculare from the Late Cretaceous period of Mongolia. These specimens provide information on tooth replacement in basalExpand
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The earliest known eutherian mammal
The skeleton of a eutherian (placental) mammal has been discovered from the Lower Cretaceous Yixian Formation of northeastern China. We estimate its age to be about 125 million years (Myr), extendingExpand
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An Early Cretaceous Tribosphenic Mammal and Metatherian Evolution
Derived features of a new boreosphenidan mammal from the Lower Cretaceous Yixian Formation of China suggest that it has a closer relationship to metatherians (including extant marsupials) than toExpand
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Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary
Estimates of the time of origin for placental mammals from DNA studies span nearly the duration of the Cretaceous period (145 to 65 million years ago), with a maximum of 129 million years ago and aExpand
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Stem Lagomorpha and the Antiquity of Glires
We describe several fossils referable to Gomphos elkema from deposits close to the Paleocene-Eocene boundary at Tsagan Khushu, Mongolia. Gomphos shares a suite of cranioskeletal characters withExpand
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Petrosals of Late Cretaceous marsupials from North America, and a cladistic analysis of the petrosal in therian mammals
ABSTRACT Ten isolated petrosals of Late Cretaceous marsupials belonging to three types—A, B, and C—are described from the Lance Formation of Wyoming and the Bug Creek Anthills of Montana. These areExpand
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The eutherian stapedial artery: character analysis and implications for superordinal relationships
Evidence from outgroups, ontogeny, neontology, and fossils is used to distinguish primitive and derived character states for the major components of the eutherian stapedial artery in 17 modernExpand
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Basicranial Evidence for Early Mammal Phylogeny
The distribution of thirty-eight basicranial characters is considered among monotremes, marsupials, placentals, and the following extinct taxa—Tritheledontidae, Tritylodontidae, Sinoconodon,Expand
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Reconstruction of the cranial vessels in the Early Cretaceous mammal Vincelestes neuquenianus: implications for the evolution of the mammalian cranial vascular system
ABSTRACT Vincelestes neuquenianus from the Early Cretaceous of Argentina is the earliest therian mammal known from nearly complete crania. Described here is the structure of the petrosal bone andExpand
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