Name: Ultrasaurus ‭(‬Ultra lizard‭)‬.
Phonetic: Ul-trah-sore-us.
Named By: Haang Mook Kim‭ ‬-‭ ‬1983.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Sauropoda,‭ ‬Eusauropoda,‭ ‬Neosauropoda.
Species: U.‭ ‬tabriensis‭ (‬type‭)‬.
Diet: Herbivore.
Size: Uncertain.
Known locations: South Korea.
Time period: Aptian/Albian of the Cretaceous.
Fossil representation: Few bones.

       Due to the incomplete nature of the holotype fossils,‭ ‬Ultrasaurus is today seen as a dubious genus of sauropod dinosaur,‭ ‬given that it would be near impossible to attribute further remains to the genus.‭ ‬Ultrasaurus is actually more‭ ‬famous for forcing a naming change in a North American genus of diplodocid dinosaur.‭ ‬In‭ ‬1985‭ ‬the palaeontologist James A.‭ ‬Jenson named three new sauropods from fossils recovered from the North American Morrison Formation.‭ ‬Unaware of Kim’s description of a South Korean sauropod in‭ ‬1993,‭ ‬Jenson named one of his sauropods Ultrasaurus macintoshi.‭ ‬Because Kim named his sauropod first,‭ ‬his description had naming priority,‭ ‬and in‭ ‬1991‭ ‬Ultrasaurus macintoshi was renamed Ultrasauros macintoshi.‭ ‬This is now a moot point however as after this Ultrasauros was discovered to be a fossil chimera composed of diplodocid and brachiosaurid‭ (‬in fact probably Brachiosaurus‭) ‬fossils.‭ ‬On top of this the holotype fossil‭ ‬of Ultrasauros,‭ ‬a single vertebra was identified as not only belonging to another one of Jenson’s‭ ‬1985‭ ‬sauropods named Supersaurus,‭ ‬but actually belonging to the same individual Supersaurus that made up the holotype,‭ ‬making Ultrasauros a synonym to Supersaurus.
       Back to the South Korean,‭ ‬Ultrasaurus there is speculation that this too may be synonymous with another sauropod genus,‭ ‬yet again,‭ ‬because of the indeterminate nature of the fossils,‭ ‬it is uncertain to prove.

Further reading
-‭ ‬Cretaceous dinosaurs from South Korea.‭ ‬-‭ ‬Journal of the Geological Society of Korea,‭ ‬19‭(‬3‭)‬:‭ ‬115-126.‭ ‬-‭ ‬H.‭ ‬M.‭ ‬Kim‭ ‬-‭ ‬1983.


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