Dorsal nostrils and hydrodynamically driven underwater olfaction in plesiosaurs

  title={Dorsal nostrils and hydrodynamically driven underwater olfaction in plesiosaurs},
  author={Arthur R. I. Cruickshank and Philip G. Small and Michael Alan Taylor},
THE dorsally placed external nostrils of plesiosaurs are usually regarded as an adaptation to breathing in those extinct marine reptiles. We suggest instead that the narial system was used in underwater olfaction. The internal nares are anterior to the external nares. Hydrodynamic pressure during swimming forced water into the mouth, along palatal grooves into the scoop-shaped internal nares and up short ducts, presumably lined with olfactory epithelia. Alternatively, or additionally, the so… 
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