![]() NMHU paleontologists published the paper naming this new dinosaur in 2007. Why It’s a Top NHMU Dinosaur: Gryposaurus monumentensis was probably the largest dinosaur in Utah’s Late Cretaceous ecosystem reaching 40 feet (12 meters) in length. Gryposaurus was a very large duck-billed dinosaur – easily reaching the same size as Tyrannosaurus rex. ![]() Three to four species of Gryposaurus have been found with a range from as far north as Alberta, Canada, to as far south as Texas, making Gryposaurus the genera with one of the largest geographical ranges. Gryposaurus monumentensis is unique compared with other species of Gryposaurus in that it the front part of the “beak” rises at a steeper angle. There are two types of hadrosaurs: those without crests, such as Gryposaurus monumentensis, and those with crests on top of their heads, called lambeosaurines. Even the name Gryposaurus means “hooked beak lizard.” “ Monumentensis” gives credit to Grand Staircase-Escalante National Monument in southern Utah where these animals were found. Geologic Formation: Kaiparowits Formation (middle unit)Ĭlassification: Ornithischia – Ornithopoda – Hadrosauridae - Hadrosaurinaeĭescription: Hadrosaurids are often referred to as “duck-billed” dinosaurs because the front of their skull resembles a bill of a duck. Where It's Found in Utah: Kane and Garfield counties, Grand Staircase-Escalante National Monument, Utah. (Pronunciation: GRIP-oh-SORE-us MAHN-you-men-TEN-siss)Īge: Late Cretaceous (~76 million years ago)
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