Fossil Evidence on Origin of the Mammalian Brain

@article{Rowe2011FossilEO,
  title={Fossil Evidence on Origin of the Mammalian Brain},
  author={Timothy Rowe and Thomas E. Macrini and Zhe-Xi Luo},
  journal={Science},
  year={2011},
  volume={332},
  pages={955 - 957}
}
Many hypotheses have been postulated regarding the early evolution of the mammalian brain. [...] Key Result We found that relative brain size expanded to mammalian levels, with enlarged olfactory bulbs, neocortex, olfactory (pyriform) cortex, and cerebellum, in two evolutionary pulses. The initial pulse was probably driven by increased resolution in olfaction and improvements in tactile sensitivity (from body hair) and neuromuscular coordination.Expand
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References

SHOWING 1-10 OF 69 REFERENCES
The emergence and evolution of mammalian neocortex
Cortical variation in mammals and other terrestrial vertebrates, re-examined by current comparative methodology (out-group analysis), indicates that separate lateral (olfactory), dorsal and medial… Expand
Coevolution of the Mammalian Middle Ear and Neocortex
  • T. Rowe
  • Biology, Medicine
  • Science
  • 1996
Phylogenetic analysis with x-ray computed tomography of fossilized and recent crania implicates differential growth of the neocortex in the evolution and development of the mammalian middle ear. In… Expand
A New Mammaliaform from the Early Jurassic and Evolution of Mammalian Characteristics
TLDR
A fossil from the Early Jurassic represents a new lineage of mammaliaforms, the extinct groups more closely related to the living mammals than to nonmammaliaform cynodonts, and shows that several key mammalian evolutionary innovations in the ear region, the temporomandibular joint, and the brain vault evolved incrementally through mammaliaform evolution and long before the differentiation of the living mammal groups. Expand
Fossil evidence on evolution of inner ear cochlea in Jurassic mammals
TLDR
The cochlear innervation in Dryolestes is the precursory condition in the curve-to-coil transformation of the cochlea in mammalian phylogeny, which provides the timing of the evolution, and where along the phylogeny the morphogenetic genes were co-opted into patterning the coChlear Innervation. Expand
Description of a cranial endocast from a fossil platypus, Obdurodon dicksoni (Monotremata, Ornithorhynchidae), and the relevance of endocranial characters to monotreme monophyly
TLDR
A digital cranial endocast of the Miocene platypus Obdurodon dicksoni was extracted from high‐resolution X‐ray computed tomography scans and is therefore important for inferring character support for Monotremata, a clade that is not well diagnosed. Expand
The Endocranial Cavity of a Nonmammalian Eucynodont, Chiniquodon theotenicus, and Its Implications for the Origin of the Mammalian Brain
ABSTRACT The braincase and endocranial cavity of a specimen of a nonmammalian eucynodont Chiniquodon is described and illustrated, and a tentative reconstruction of the gross anatomy of the brain… Expand
The endocranial cast of the advanced mammal-like reptile Therioherpeton cargnini (Therapsida-Cynodontia) from the Middle Triassic of Brazil.
TLDR
The morphology of the endocast and relative brain size of Therioherpeton cargnini are in general agreement with other features of the species that locates it as one of the more advanced cynodont toward mammalian patterns, and this may imply that the brain does not evolved more conservatively than other characters at the reptile-mammal transition. Expand
Phylogenetic Systematics and the Early History of Mammals
TLDR
In a series of computer parsimony analyses, different rates of evolution in the dentition, skull, and postcranium were responsible for different tree topologies that resulted when different, restricted character samples were analyzed. Expand
A new reconstruction of multituberculate endocranial casts and encephalization quotient of Kryptobaatar
TLDR
An endocast of the Late Cretaceous Kryptobaatar is described, which differs from those of other multituberculates in having unusually long olfactory bulbs and the paraflocculi elongated transversely, rather than ball−shaped. Expand
THE BRAIN OF LEPTICTIS DAKOTENSIS, AN OLIGOCENE LEPTICTID (EUTHERIA: MAMMALIA)
Observations of previously undescribed endocasts referable to the Oligocene leptictid Leptictis dakotensis yield new and revised information on the brain features of this species. The neocortex is… Expand
...
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