Concept

Enigmosaurus

Enigmosaurus (meaning "Enigma lizard" or "Enigmatic lizard") is a genus of therizinosauroid that lived in Asia during the Late Cretaceous period. It was a medium-sized, ground-dwelling, bipedal herbivore that represents the third therizinosaur taxon from the Bayan Shireh Formation, although it is known from the lower part. The genus is monotypic, including only the type species E. mongoliensis, known from a well preserved pelvis and other tentative body remains. The holotype, IGM 100/84, was discovered at the Khara Khutul locality in the Bayan Shireh Formation (sometimes called Baynshire Formation or the Baynshirenskaya Svita), southeastern Mongolia, dating from the Late Cretaceous period, and first reported in 1979 on a pelvic comparison with other theropod dinosaurs. At the time, little was known about therizinosaurs. In 1980, it was mentioned again, this time in the new infraorder created by the Mongolian paleontologists Rinchen Barsbold and Altangerel Perle: Segnosauria. Nicknamed as the "Dinosaur from Khara Khutul", it was shortly described and included into the Segnosauria. Three years later, the type species, Enigmosaurus mongoliensis, was named and described in 1983 by Barsbold. The preserved elements consist of a partial skeleton, lacking the skull, that includes a well preserved pelvic girdle with other postcrania. The generic name, Enigmosaurus, was stated to be derived from Greek αίνιγμα (aínigma, meaning enigma) and σαῦρος (sauros, meaning lizard), in reference to the aberratic and unusual shape of its pelvis. The specific name, mongoliensis, refers to the country of its discovery, Mongolia. Some therizinosaur fossil findings at the Iren Dabasu Formation were first thought to be referable to Enigmosaurus. Although it is commonly known from the pelvis, several remains not mentioned in the original description of the holotype were labelled under the same specimen number (IGM 100/84).

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