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Antrodemus and Shidaisaurus

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By SpinoInWonderland   |   
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Two Jurassic theropods.

Antrodemus valens is a dubious species of theropod dinosaur from the Kimmeridgian-Tithonian-age Late Jurassic Morrison Formation. It was first described and named as a species of Poekilopleuron by Joseph Leidy in 1870.

Shidaisaurus jinae is a species of basal tetanuran theropod found in early Middle Jurassic-age rocks of the Upper Lufeng Formation in China. It is known from a partial skeleton, holotype DML-LCA 9701-IV, lacking most of the caudal vertebrae, ribs, pectoral girdle, and limb bones. It was described in 2009 by Wu and colleagues.
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anonymous's avatar
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Saberrex's avatar
SaberrexHobbyist General Artist
Antrodemus and Allosaurus are one and the same. 
SpinoInWonderland's avatar
That was in the past, and during that time, Antrodemus was the valid name. They were split when the dubiousness of Antrodemus was really realized, and they were never lumped again.

So separate they are.
Saberrex's avatar
SaberrexHobbyist General Artist
after reading this, i went in and looked at Antrodemus, and scientists could find no distinguishing features that could differentiate it from other theropods.
SpinoInWonderland's avatar
It has poor diagnostic features in general. I don't think it's wise to just lump it in to another taxon without further evidence.
Saberrex's avatar
SaberrexHobbyist General Artist
good point.