Poekilopleuron (meaning "Various Ribs") is a genus of large basal theropodperhaps belonging to the clade Allosauroidea. It grew 30 feet in length and weighed 1 ton in mass. The genus comes from the Middle Jurassic (Bathonian stage) of France, about 168 to 165 million years ago. Poekilopleuron is known from a partial skeleton discovered by Jacques Amand Eudes-Deslongchamps in July 1835 near La Maladrerie in Normandy, France, in a layer of the Calcaire de Caen Formation. This skeleton, part of the collection Musee de la Falcutee des Sciences de Caen, was in 1944 destroyed during the Battle of Caen in World War 2, and the taxon has since had to be studied on the basis of cast replicas. One set is present in the Museum National d'Histoire Naturelle in Paris with inventory number MNHN 1897-2, a second in the Yale Peabody Museum, YPM 4938. The remains consisted of caudal vertebrae, cervical ribs, ribs, belly ribs (gastralia), a forelimb and a hindlimb. The most distinctive feature of Poekilopleuron were its forelimbs. Their length, about 2 feet long, was a sign of this theropod's more original build. Unlike later Theropoda, whose forelimbs tened toward reduction in length in proportion to the animal's body size, Poekilopleuron's arms were long and, by implication, potent. The length mostly resided in the elongated but powerfully muscled humerus.

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