Atlasaurus is a genus of sauropod dinosaurs from Middle Jurassic (Bathonian to Callovian stages) beds in North Africa. Description Atlasaurus differs from Brachiosaurus relative to the estimated length of the dorsal vertebral column (assuming 12 vertebrae, ), in having a proportionately larger skull, a shorter neck (with at least 13 cervical vertebrae, shorter and more uniform in length than Brachiosaurus), a longer tail and more elongated limbs (humerus to femur ratio: 0.99; ulna to tibia ratio: 1.15). The teeth are spoon-shaped and have denticles. The lower jaw of Atlasaurus is about long, the neck was about long, the humerus long, and the femur about long. It has been estimated at in length, and in weight. Discovery and naming The Atlasaurus holotype was discovered in 1981 described by Monbaron, Russell & Taquet in 1999. It was named after the location of discovery in the High Atlas range of the Atlas Mountains of Morocco (where the Titan Atlas was said to hold up the heavens), and for the animal's size (about long). It is known from a nearly complete skeleton with a skull found at Wawmda, in the Middle Jurassic (Bathonian-Callovian) Guettioua Formation in Morocco's Azilal Province. The type species is Atlasaurus imelakei, the specific name coming from Arabic عملاق ("eimlaq" or "imelake"), meaning "giant". A second specimen of A. imelakei, a near-complete tail, was also discovered in Morocco and was pieced back together in Utah after 300 hours of preparation. It was eventually sent to Mexico and was put on display in the lobby of the BBVA Bancomer tower in Mexico City until it was auctioned off to an anonymous businessman in January 2018 to pay for the rebuilding of schools destroyed during the 2017 Puebla earthquake. Classification It was classified as a relatively primitive sauropod identified as a "cetiosaur" when first discovered, although upon further study, Atlasaurus appears to be closer to Brachiosaurus than to any other known sauropod based on detailed similarities between the vertebral column and limbs. However, more recent analyses have considered it to be a putative member of the Turiasauria. The most recent analysis of turiasaurs recovers Atlasaurus as a brachiosaurid. References Sauropods Middle Jurassic dinosaurs of Africa Jurassic Morocco Fossils of Morocco Fossil taxa described in 1999 Taxa named by Dale Russell Taxa named by Philippe Taquet