Name: Claosaurus ‭(‬Broken lizard‭)‬.
Phonetic: Clay-o-sore-us.
Named By: Othniel Charles Marsh‭ ‬-‭ ‬1890.
Synonyms: Hadrosaurus agilis.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ornithopoda,‭ ‬Hadrosauroidea.
Species: C.‭ ‬agilis‭ (‬type‭)‬,‭ ‬C.‭ ‬affinis‭?
Diet: Herbivore.
Size: Roughly about‭ ‬3.5‭ ‬meters long.
Known locations: USA,‭ ‬Kansas‭ ‬-‭ ‬Niobrara Formation,‭ ‬Montana‭ ‬-‭ ‬Pierre Shale Formation,‭ ‬South Dakota‭ ‬-‭ ‬Pierre Shale Formation,‭ ‬Texas‭ ‬-‭ ‬Aguja Formation.
Time period: Campanian/Maastrichtian of the Cretaceous.
Fossil representation: Partial remains of a few individuals.

       First named as a species of Hadrosaurus by Othniel Charles Marsh in‭ ‬1872,‭ ‬Marsh later renamed this species as a distinct genus,‭ ‬Claosaurus in‭ ‬1890.‭ ‬A second species,‭ ‬C.‭ ‬affinis,‭ ‬is now considered to be highly dubious,‭ ‬not only upon the grounds that‭ ‬it was based upon very fragmentary toe bones,‭ ‬but that this fossils have now become lost,‭ ‬making further studies on this species impossible.
       Claosaurus is so far notable for three reasons.‭ ‬First is that the genus is considered to be a hadrosauroid,‭ ‬the group that the more advanced hadrosaurids‭ (‬i.e.‭ ‬Edmontosaurus,‭ ‬Parasaurolophus,‭ ‬Hypacrosaurus,‭ ‬etc‭) ‬came from.‭ ‬Claosaurus however is so far the most advanced hadrosauroid known without actually being a true hadrosaurid.‭ ‬Second is that Claosaurus grew to a fairly small size averaging only about three and a half meters in length.‭ ‬Third,‭ ‬is that several specimens of Claosaurus have been found in marine sediments.‭ ‬This could either indicate that these individuals were living in coastal environments,‭ ‬or were swept out to sea in flood waters.

Further reading
-Additional characters of the Ceratopsidae,‭ ‬with notice of new Cretaceous dinosaurs.‭ ‬-‭ ‬American Journal of Science‭ ‬39:418-426.‭ ‬-‭ ‬Othniel Charles Marsh‭ ‬-‭ ‬1890.
-‭ ‬The type of Claosaurus‭ (?) ‬affinis Wieland.‭ ‬-‭ ‬American Journal of Science‭ ‬246:‭ ‬29‭–‬30.‭ ‬-‭ ‬Joseph T.‭ ‬Gregory‭ ‬-‭ ‬1948.


Random favourites