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Hypsilophodon Dinosaur of the Day
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Hypsilophodon: Dinosaur of the Day • I Know Dino: The big dinosaur podcast. News, interviews, and discussions about dinosaurs. Are you a dinosaur enthusiast? Learn more at / iknowdino . • You can also visit http://www.IknowDino.com for more information including a link to dinosaur sites near you. • Hypsilophodon, an ornithopod, whose name means “Hypsilophus-tooth” • Lived in the early Cretaceous, in what is now England • Type species is Hypsilophodon foxii, named in 1869-70 • Found in the Wessex Formation in the Isle of Wight • Almost 100 specimens have been found on the Isle of Wight (over 20 dinosaur species found there) • 20 Hypsilophodon specimens have been found in one place, where they died together (may have been in quicksand) • Reverend William Fox, discovered the 1868 specimen (with skull), so the type species is named after him • Small, bipedal, about 5.9 feet (1.8 meters) long, weighed about 45 pounds (20 kg) • Agile runner, and had a sharp beak it used to bite off vegetation • Herbivore, and possibly an omnivore • Lots of misconceptions: scientists used to think Hypsilophodon climbed trees and was armored • First found in 1849, and two pieces were sold (one to naturalist James Scott Bowerbank); at the time, they thought it was the bones of a young Iguanodon (Mantell described it as an Iguandon in 1849, as did Richard Owen in 1855) • Paleontologist Thomas Henry Huxley wrote a more comprehensive description in 1870 (after studying the skull); Huxley was the first to note that Ornithischians had pubic bones that pointed backwards, like birds • Huxley chose the name Hypsilophodon because he wanted it to be similar to Iguanodon’s name (means iguana-tooth) so he chose named the dinosaur after an “extant herbivorous lizard” • Richard Owen still thought Hypsilophodon was not a different genus, and renamed it in 1874 Iguanodon foxii, but scientists rejected it (John Whitaker Hulke had more specimens from Fox) • In 1874 Hulke described Hypsilophodon as armored, but in 2008 Galton wrote the armor was actually from the torso, “an example of internal intercostal plates associated with the rib cage. It consists of thin mineralized circular plates growing from the back end of the middle rib shaft and overlapping the front edge of the subsequent rib” • In 1882 Hulke said Hypsilophodon was probably quadrupedal, but also climbed rocks and trees (because of its grasping hand). In 1912 paleontologist Othenio Abel said it was a aroboreal animal, and in 1916 Gerhard Heilmann said it lived like a modern tree kangaroo. But in 1926 Heilmann changed his mind and said the first toe was not opposable because it was “firmly connected to the second”. In 1927 Abel denied this description, and in 1936 Swinton said even though the first metatarsal was forward pointing it might have a moveable toe. In 1969 Peter M. Galton analyzed the skeleton, and described Hypsilophon as not being able to climb, but instead a bipedal runner. • Most Hypsilophodon specimens were found between 1849 and 1921, and are now in the Natural History Museum in London (about 20) • 1967 Peter Malcolm Galton published his thesis on Hypsilophodon, starting modern research on the dinosaur • In 1978-79, Galton and James Jensen named another Hypsilophodon species, Hypsilophodon wielandi, after George Reber Wieland found a thigh bone in South Dakota. They thought Hypsilophodon wielandi was proof of a land bridge between North America and Europe, but now the specimen is considered an “indeterminate basal ornithopod” • Hypsilophodon had primitive features, such as five digits on each hand and four digits on each foot (its fifth finger was opposable and could grab food); had a beak like other ornithischians, but also had five teeth in its premaxilla (front of the upper jaw)–most other herbivores in its time no longer had these front teeth) • Had a large eye socket, and thin, pointy bones over the top half of its eyes to give it shade (and make it look fierce) • Short, large skull, with a triangular snout, and a beak • To learn more about dinosaurs and I Know Dino, connect with us on the following sites: • Facebook: / iknowdino • Twitter: / iknowdino • Tumblr: / iknowdino • Google+: https://plus.google.com/u/0/100785970... • Pinterest: / dinosauria • LinkedIn: / i-know-dino • Goodreads: https://www.goodreads.com/review/list... • iTunes: https://itunes.apple.com/us/podcast/i... • Sound Cloud: / iknowdino • Stitcher: http://www.stitcher.com/podcast/i-kno... • For more I Know Dino videos, subscribe to our YouTube channel at / @iknowdino
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