Nostril Position in Dinosaurs and Other Vertebrates and Its Significance for Nasal Function

@article{Witmer2001NostrilPI,
  title={Nostril Position in Dinosaurs and Other Vertebrates and Its Significance for Nasal Function},
  author={Lawrence M. Witmer},
  journal={Science},
  year={2001},
  volume={293},
  pages={850 - 853}
}
  • L. Witmer
  • Published 3 August 2001
  • Biology
  • Science
Many dinosaurs have enormous and complicated bony nasal apertures. Functional interpretation requires knowledge of the location of the external opening in the skin. Traditionally, the fleshy nostril of dinosaurs has been placed in the back of the bony opening, but studies of extant dinosaur relatives suggest that it is located far forward. Narial blood supply and cavernous tissue corroborate the rostral position in dinosaurs. A rostral nostril was, and remains, a virtually invariant rule of… 
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References

SHOWING 1-10 OF 44 REFERENCES
Homology of facial structures in extant archosaurs (birds and crocodilians), with special reference to paranasal pneumaticity and nasal conchae
TLDR
The facial anatomy of extant birds and crocodilians is examined in detail to provide background and to discover those apomorphic aspects that contribute to the divergent specialization of these two groups and thus obscure homologies.
Studies of the vascular arrangements of the nose.
TLDR
Swindle (1935, 1937) is the only worker who has made a comprehensive study of the vascular arrangements of the nose in animals, but his chief contribution was to demonstrate that in some species the veins lie superficial to the arteries, while in other species the arteries lie shallow to the veins.
Principal characters of American Jurassic dinosaurs; Part VII, On the Diplodocidae, a new family of the Sauropoda
TLDR
A third family is represented by the genus Diplodocus, a study of which, more especially of the skull, throws light on the whole group of Dinosaurian reptiles.
Functional anatomy of the olfactory system in 23 orders of birds.
Interestingly, functional anatomy of the olfactory system in 23 orders of birds supplementum 58 1 ad acta anatomica vol 79 1971 that you really wait for now is coming. It's significant to wait for
Principal characters of American Jurassic dinosaurs; Part VI, Restoration of Brontosaurus.
IN the previous articles of this series, the writer has given the more important characters of the order 8auropoda.* A volume on this group is now in preparation, and the illustrations (90 plates)
Panting in reindeer (Rangifer tarandus).
TLDR
Estimates suggest that the potential for selective brain cooling is markedly reduced during open-mouth panting in reindeer as a consequence of this airflow pattern.
Ecology of the Brontosaurs
  • R. Bakker
  • Environmental Science, Geography
    Nature
  • 1971
A reconsideration of brontosaur remains suggests that the largest dinosaurs were not semi aquatic but terrestrial, in spite of their high external nares.
The contribution of nasal countercurrent heat exchange to water balance in the northern elephant seal, Mirounga angustirostris.
TLDR
Nal temporal countercurrent heat exchange in the nasal passage reduces total water loss sufficiently to allow maintenance of water balance using metabolic water production alone.
On the Saurians Recently Discovered in the Dakota Beds of Colorado
  • E. Cope
  • Geology
    The American Naturalist
  • 1878
TLDR
The deposit of the sands which became the Dakota rocks, marks the beginning of the cretaceous ocean in North America, and is the No.
THE COOLING POWER OF THE PIGEON HEAD
TLDR
It is concluded that beak opening, together with a source of convection other than panting and gular flutter, is required to exploit fully the heat dissipation capacity of the buccopharyngeal mucosa of birds.
...
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