Name: Nanosaurus ‭(‬small lizard‭)‬.
Phonetic: Nah-noe-sore-us.
Named By: Othniel Charles Marsh‭ ‬-‭ ‬1877.
Synonyms: Drinker, Laosaurus consors, Nanosaurus rex, Othnielia, Othnielosaurus.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Nanosauridae.
Species: N.‭ ‬agilis‭ (‬type‭)‬.
Diet: Herbivore.
Size: Upto‭ ‬2‭ ‬meters long.
Known locations: USA,‭ ‬Colorado‭ ‬-‭ ‬Morrison Formation.‭ ‬Maybe also Wyoming.
Time period: Late Jurassic.
Fossil representation: Based upon partial dentary and fragmentary remains of the skull and post cranial skeleton.

       Nanosaurus used to be an uncertain‭ genus of ornithopod dinosaur.‭ ‬In the past three species have been named for Nanosaurus,‭ ‬N.‭ ‬agilis,‭ ‬N.‭ ‬rex and N.‭ ‬Victor.‭ ‬The holotype of N.‭ ‬rex was used to create the genus Othnielia in‭ ‬1977,‭ ‬while N.‭ ‬victor was later realised to be based upon crocodilian remains.‭ ‬This meant that for some time the only valid species of Nanosaurus remaining is the type species,‭ ‬N.‭ ‬agilis.
       Then in a‭ ‬2018‭ ‬study‭ ‬(Carpenter‭ & ‬Galton‭) ‬new fossils of an ornithishcian dinosaur were described.‭ ‬These fossil bones bore a‭ ‬striking similarity to not only the type species material of Nanosaurus,‭ ‬but also other fossils that had been previously removed from the genus to become new genera.‭ ‬Additionally the genus Drinker was also seen to be so similar it was‭ ‬almost certainly synonymous with Nanosaurus.
       Nanosaurus seems to‭ ‬have been one of the principal small dinosaurs roaming‭ ‬North America during the late Jurassic.‭ ‬Nanosaurus would have been a browser of low growing vegetation,‭ ‬where shelter and‭ ‬cover may have also been sought from the eyes of‭ ‬the numerous predatory dinosaurs also roaming the land at the same time.

Further reading
-‭ ‬Notice of some new vertebrate fossils.‭ ‬-‭ ‬American Journal of Science‭ (‬Series‭ ‬3‭) ‬14:249-256.‭ ‬-‭ ‬Othniel Charles Marsh‭ ‬-‭ ‬1877a.
-‭ ‬Notice of new dinosaurian reptiles from the Jurassic formations.‭ ‬-‭ ‬American Journal of Science‭ (‬Series‭ ‬3‭) ‬14:514-516.‭ ‬-‭ ‬Othniel Charles Marsh‭ ‬-‭ ‬1877b.
-‭ ‬Principal characters of American Jurassic dinosaurs.‭ ‬Part V.‭ ‬-‭ ‬American Journal of Science‭ ‬21:‭ ‬418‭–‬423.‭ ‬-‭ ‬Othniel Charles Marsh‭ ‬-‭ ‬1881.
-‭ ‬The ornithopod dinosaur Dryosaurus and a Laurasia-Gondwanaland connection in the Upper Jurassic.‭ ‬-‭ ‬Nature‭ ‬268:‭ ‬230-232.‭ ‬-‭ ‬Peter M.‭ ‬Galton‭ ‬-‭ ‬1977.
-‭ ‬Teeth of ornithischian dinosaurs‭ (‬mostly Ornithopoda‭) ‬from the Morrison Formation‭ (‬Upper Jurassic‭) ‬of the western United States‭ ‬-‭ ‬Peter M.‭ ‬Galton‭ ‬-‭ ‬In,‭ ‬Horns and Beaks:‭ ‬Ceratopsian and Ornithopod Dinosaurs.‭ ‬Indiana University Press:‭ ‬Bloomington‭ ‬-‭ ‬Kenneth Carpenter‭ (‬ed‭) ‬-‭ ‬2007.‭
- A photo documentation of bipedal ornithischian dinosaurs from the Upper Jurassic Morrison Formation, USA. - Geology of the Intermountain West. 5: 167–207. - Kenneth Carpenter & Peter M. Galton - 2018.


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