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The Placental Mammal Ancestor and the Post–K-Pg Radiation of Placentals
A phylogenetic tree shows that crown clade Placentalia and placental orders originated after the K-Pg boundary, but phenomic signals overturn molecular signals to show Sundatheria (Dermoptera + Scandentia) as the sister taxon of Primates, a close link between Proboscidea and Sirenia (sea cows), and the monophyly of echolocating Chiroptera (bats).
Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure
The Mesozoic Mammals in Space and Time and the Interrelationships of Mesozoics Mammals are studied to understand the distribution and relationships of these animals.
The earliest known eutherian mammal
- Q. Ji, Zhe‐Xi Luo, Chongxi Yuan, J. Wible, Jian-Ping Zhang, J. Georgi
- Biology, MedicineNature
- 25 April 2002
The skeleton of a eutherian (placental) mammal found in northeastern China has limb and foot features that are known only from scansorial and arboreal extant mammals, in contrast to the terrestrial or cursorial features of other Cretaceous eutherians.
An Early Cretaceous Tribosphenic Mammal and Metatherian Evolution
New data from this fossil support the view that Asia was likely the center for the diversification of the earliest metatherians and eutherians during the Early Cretaceous.
In quest for a phylogeny of Mesozoic mammals
A phylogeny of all major groups of Mesozoic mammals based on phylogenetic analyses of 46 taxa and 275 osteological and dental characters, using parsimony methods is proposed, suggesting that the “obtuse−angle symmetrodonts” are paraphyletic, and that they lack reliable and unambiguous synapomorphies.
A Jurassic eutherian mammal and divergence of marsupials and placentals
This mammal has scansorial forelimb features, and provides the ancestral condition for dental and other anatomical features of eutherians, reducing and resolving a discrepancy between the previous fossil record and the molecular estimate for the placental–marsupial divergence.
Dual origin of tribosphenic mammals
Phylogenetic and morphometric analyses including these newly discovered taxa suggest a different interpretation: that mammals with tribosphenic molars are not monophyletic.
Fossil Evidence on Origin of the Mammalian Brain
Evidence from two early fossils suggests that brain enlargement and specialization proceeded in three pulses. Many hypotheses have been postulated regarding the early evolution of the mammalian…
Relationships of the Liassic Mammals Sinoconodon, Morganucodon oehleri, and Dinnetherium
New skulls of Sinoconodon and Morganucodon oehleri are studied from the Liassic of Yunnan, China, and the Kayenta Formation of Arizona to address the lack of morphological information about the relationships of advanced cynodonts and early mammals.
Terrestrial Mesonychia to Aquatic Cetacea: Transformation of the Basicranium and Evolution of Hearing in Whales
Morphological and stratigraphic evidence indicates that land-living mesonychian ungulates are broadly ancestral to early amphibious and later aquatic cetaceans. The transition from terrestrial…