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Altirhinus (meaning “High Nose”) is a genus of iguanodontid from the Early Cretaceous of Mongolia. The type species, A. kurzanovi, was described by David B. Norman in 1998. The specific name is called kurzanovi for Sergei Kurzanov, the Russian scientist that originally found the specimen in 1981. In the original description, Norman stated that Altirhinus could grow to be 26 feet (8 metres) long. In 2010, however, Gregory S. Paul estimated at 21 feet (6.5 metres) long. The skull itself is 30 inches (760 millimetres) long. It had a curved, tall snout (called a nasal arch), hence the name. The nasal arch was similar to Muttaburrasaurus or Gryposaurus. It was discovered in the Khukhtek Formation in Mongolia. It was originally assigned to Iguanodon orientalis. I. orientalis was dubious, and was later reassigned to I. bernissartensis. At around that time, Altirhinus was reassigned to I. kurzanovi, until being considered it’s own genus circa 1997. It was originally assigned to iguanodontid by Norman with Iguanodon and Ouranosaurus. Since then, it has been drifting further away, similar in pattern to Muttaburrasaurus. Although it is pretty far from Iguanodon and Ouranosaurus, it is not as far as Protohadros. It is probably closest to Fukuisaurus.

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