Name: Sarcosaurus ‭(‬Flesh lizard‭)‬.
Phonetic: Sar-ko-sore-us.
Named By: Charles William Andrews‭ ‬-‭ ‬1921.
Synonyms: Possibly Sarcosaurus andrewsi.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda.
Species: S.‭ ‬woodi‭ (‬type‭)‬.
Diet: Carnivore.
Size: Estimated at around‭ ‬3.5‭ ‬meters long.
Known locations: England‭ ‬-‭ ‬Lower lias.
Time period: Sinemurian of the Jurassic.
Fossil representation: Pelvis,‭ ‬vertebrae and upper portion of a femur.

       There is not a lot of information about Sarcosaurus due to the relatively incomplete remains from only the pelvic region of the body.‭ ‬This makes it impossible to ascertain the form and structure of other body parts such as the head,‭ ‬hands and feet,‭ ‬something that makes exact classification of this dinosaur near impossible.‭ ‬In the past Sarcosaurus has been classified as a megalosauroid‭ (‬similar to Megalosaurus‭)‬,‭ ‬a ceratosaur‭ (‬similar to Ceratosaurus‭) ‬to even a coelophysoid‭ (‬similar to Coelophysis‭)‬.
       Sarcosaurus also has an intermeshed taxonomic history with other dinosaurs,‭ ‬specifically Magnosaurus.‭ ‬In‭ ‬1932‭ ‬the German palaeontologist Friedrich von Huene assigned a tibia‭ (‬lower leg bone‭) ‬to both Magnosaurus and Sarcosaurus and additionally included the type species of Sarcosaurus within Magnosaurus that was newly created at the time.‭ ‬Later however von Huene assigned priority of the tibia to Sarcosaurus as a second species called S.‭ ‬andrewsi‭; ‬however in‭ ‬1974‭ ‬this was in turn reclassified as a species of Megalosaurus by Michael Waldman.‭ ‬Today the second species‭ ‬of S.‭ ‬andrewsi is considered a nomen dubium because other palaeontologists either consider there to be no appreciable difference,‭ ‬or come to the conclusion that it is impossible to assign a new fossil to Sarcosaurus since there are no other remains to compare it to.‭
       Another set of post cranial remains was assigned to Sarcosaurus by von Huene in‭ ‬1932,‭ ‬however there is uncertainty to the validity of these remains as well.‭ ‬However again it has proven impossible to conclusively attribute these remains to Sarcosaurus and the remains in question are currently known as‭ ‘‬Liassaurus‭’‬.‭ ‘‬Liassaurus‭’ ‬however is an informal name,‭ ‬and the remains they describe are currently considered to represent an unidentifiable theropod dinosaur‭ (‬due to the incomplete preservation of this skeleton‭)‬.‭ ‬This does not entirely rule out the possibility that‭ '‬Liassaurus‭’ ‬may still actually be another specimen of Sarcosaurus,‭ ‬which is why it is often considered a nomen nudum,‭ ‬which basically means that it is a‭ ‘‬naked name‭’ ‬that is not considered scientifically valid.

Further reading
- On some remains of a theropodous dinosaur from the Lower Lias of Barrow-on-Soar. - Annals and Magazine of Natural History, series 9 8:570-576. - C. W. Andrews - 1921.
- A revision of the early neotheropod genus Sarcosaurus from the Early Jurassic (Hettangian–Sinemurian) of central England. - Zoological Journal of the Linnean Society. - M. D. Ezcurra, R. J. Butler, S. C. R. Maidment, I. J. Sansom, L. E. Meade & J. D. Radley - 2020.


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