Elaphrosaurus

E-laf-roe-sore-us.
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John Stewart

Paleoecologist

John Stewart is a distinguished paleoecologist whose work has significantly advanced our understanding of prehistoric ecosystems. With over two decades dedicated to unearthing fossils across Asia and Africa

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Name

Elaphrosaurus ‭(‬Lightweight lizard‭)‬.

Phonetic

E-laf-roe-sore-us.

Named By

Werner Janensch‭ ‬-‭ ‬1920.

Classification

Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda,‭ ‬Neotheropoda,‭ ‬Ceratosauria.

Diet

Carnivore.

Species

E.‭ ‬bambergi

Size

Around‭ ‬6.2‭ ‬meters long.

Known locations

Tanzania‭ ‬-‭ ‬Tendaguru Formation.‭ ‬Possibly also USA‭ ‬-‭ ‬Morrison Formation.

Time Period

Tithonian of the Jurassic,‭ ‬possibly into early Cretaceous.

Fossil representation

Almost complete skeleton.‭ ‬Skull unknown.

In Depth

       Elaphrosaurus has been something of an enigma for palaeontologists as while it is generally regarded as a ceratosaur,‭ ‬its proportions are similar to some other kinds of theropods.‭ ‬The overall appearance of Elaphrosaurus is that of a lightweight hunter that relied more upon speed rather than strength to take down prey.‭ ‬The tibia in particular is longer than the femur which is a good sign that Elaphrosaurus would have been a fast runner.‭ ‬In fact it is these leg proportions that once led to the suggestion that Elaphrosaurus may have been a primitive ornithomimosaur after it was initially thought to have been a late surviving coelophysid.‭ ‬The latter conclusion was based upon the long neck that probably supported a smaller skull than other theropods which are known to have larger skulls on shorter necks.

       Some changes regarding the assignment of fossils have taken place over the years.‭ ‬A former species named from Nigerian fossil material called Elaphrosaurus gautieri was renamed in‭ ‬2004‭ ‬as Spinostropheus.‭ ‬Other remains from the Morrison Formation of the United States have been regarded as possibly being the same genus as Elaphrosaurus,‭ ‬but at the time of writing are not yet officially recognised.

Further Reading

– Ueber Elaphrosaurus bambergi und die Megalosaurier aus den Tendaguru-Schichten Deutsch-Ostafrikas [On Elaphrosaurus bambergi and the megalosaurs of the Tendaguru Formation of German East Africa] – Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 1920:225-235 – W. Janensch – 1920. – Elaphrosaurus, an ornithomimid dinosaur from the Upper Jurassic of North America and Africa – Pal�ontologische Zeitschrift. 56, 265-275 – P. Galton – 1982. – The second record of the African theropod Elaphrosaurus (Dinosauria, Ceratosauria) from the Western Hemisphere – Neues Jahrbuch f�r Geologie und Pal�ontologie Monatshefte. 2001(9), 565-576 – Chure – 2001.

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