Arstanosaurus

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Arstanosaurus (meaning "Arstan lizard") is the name given to a genus of dinosaur, now known to be invalid. The fossils are now believed to have been the remains of two separate genera of dinosaurs, which were believed for a time to have come from the same dinosaur.

The type species, Arstanosaurus akkurganensis, was formally described by Suslov and Shilin in 1982. Variously classified as a ceratopsian or a hadrosaur, the fossils were collected from several locations in Mongolia, and are probably chimeric. A femur and teeth were collected from the Baynshireh Formation of the Gobi Desert, in Mongolia, and fragments of a jaw (maxilla) from another location (Aral region of Kazakhstan) were also referred to this genus. D. B. Norman, 1997, declared the fossilised remains indeterminate.