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"Ischyrosaurus" (meaning "strong lizard", for its large humerus; name in quotation marks because it is preoccupied) was a genus of sauropod dinosaur from the Kimmeridgian-age Upper Jurassic Kimmeridge Clay of Dorset, Cambridgeshire, England. It is sometimes included with the Early Cretaceous-age wastebasket taxon Pelorosaurus, although there is little evidence for this.

History and Taxonomy[]

"Ischyrosaurus" is based on a partial humerus (BMNH R41626) found in 1868. John Hulke described it briefly in 1869, then named it in 1874. The genus is preoccupied by a name Edward Drinker Cope coined in 1869.

Like most sauropod remains from the Upper Jurassic-Lower Cretaceous of Europe, it became part of the Pelorosaurus-Ornithopsis taxonomic tangle, being referred first to Ornithopsis as O. manseli, then to Pelorosaurus as P. manseli.

Upchurch et al., in the most recent review (2004), lists it as a dubious sauropod of unknown affinities. A new name is technically required, but because of the fractured taxonomy of Jurassic-Cretaceous European sauropods, researchers are waiting for better material.

Paleobiology[]

As a sauropod, it would have been a large quadrupedal herbivore.

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