Tribute to Nothronychus

Nothronychus is a genus of dinosaur classified in the group Therizinosauria, strange theropods with a toothless beak, a bird-like hip (resembling the non-related ornithischians) and four-toed feet, with all four toes facing forward. The type species of this dinosaur was found by Kirkland and Douglas G. Wolfe in 2001 near New Mexico's border with Arizona, in an area known as the Zuni Basin. The name Nothronychus, derived from Greek meaning 'sloth-like claw', was selected because the animal reminded Kirkland of a giant ground sloth. It is the first example of therizinosaurs to be found in the Americas. Previous discoveries had been from China and Mongolia. Nothronychus was larger than Erlikosaurus or Segnosaurus but in some ways more primitive than these Asian relatives. A related dinosaur from a significantly earlier period, Falcarius utahensis, was discovered in Utah in 2005. The sloth-like Nothronychus lived 90 million years ago, during the Late Cretaceous Period of the Mesozoic era, in swampy forests similar to modern bayous in Louisiana. The era was a period of extreme global warming, with ocean levels 300 m (1000 ft) higher than current levels and a significantly reduced amount of dry land. Almost no dinosaur fossils have been found from this time, particularly in North America, making this and associated discoveries very important. Nothronychus is a member of the theropod group of carnivorous dinosaurs that includes Tyrannosaurus but Nothronychus, and its close ...

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