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mesosaur Line breaks: meso|saur
Pronunciation: /ˈmɛsəsɔː/

Definition of mesosaur in English:


An extinct small aquatic reptile of the early Permian period, with an elongated body, flattened tail, and a long, narrow snout with numerous pointed teeth.
  • Genus Mesosaurus, order Mesosauria, subclass Anapsida
Example sentences
  • The most basal anapsids, the mesosaurs, are oldest known fully aquatic reptiles.
  • At the same time as the mesosaurs were flourishing in this newly formed inland sea, a major period of mountain building began in the south, due to the Andean-style collision of the Palaeo-Pacific plate under the African plate.
  • Only mesosaurs and araeoscelidians demonstrate more lightly built limbs than protorothyridids.


1950s: modern Latin, from Greek mesos 'middle' + sauros 'lizard'.

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