Bajocian

Magnosaurus - Video Learning - WizScience.com

• Report rights infringement
• published: 04 Aug 2015
• views: 54

""Magnosaurus"" was a genus of basal tetanuran theropod dinosaur from the Middle Jurassic of England. It is based on fragmentary remains and has often been confused with or included in "Megalosaurus". In 1923, Friedrich von Huene named "Megalosaurus nethercombensis" from a partial skeleton from the Aalenian-Bajocian-age Middle Jurassic Inferior Oolite, found in the nineteenth century by W. Parker near Nethercomb, north of Sherborne, in Dorset, England. The material included partial dentaries, dorsal and caudal vertebrae, a partial ilium, a partial right pubis, internal casts of the femora, and tibiae, from a possibly juvenile individual. Huene interpreted it as a more primitive species of "Megalosaurus". In 1926, he named the tooth species "Megalosaurus lydekkeri" for a specimen, BMNH 41352, from the Lower Lias of England that Richard Lydekker had first described in 1888. Finally, in 1932, he created the genus "Magnosaurus" for "M. nethercombensis", referred "M. lydekkeri" to it, and created a third species, "M. woodwardi", for the genus. "M. woodwardi" was based on a tibia from the Lower Lias, which he simultaneously and accidentally also named "Sarcosaurus andrewsi"; in 1956 the latter name was given priority by von Huene. Even more confusing, in the same 1932 publication von Huene renamed "Sarcosaurus woodi" into "Magnosaurus woodi". Until the 1990s, the genus had been ignored as a species of "Megalosaurus". However, with growing concern over what exactly is constituted by "Megalosaurus", "Magnosaurus" has been generally separated as its own genus. Also, there are morphological differences: for example, possible "Megalosaurus" tibiae are compressed at the far end, unlike those of "Magnosaurus". Rauhut considered it and "Eustreptospondylus" to be the same genus, because the two share a similarly expanded front tip of the dentary and enlarged third dentary tooth. He therefore renamed "Eustreptospondylus oxoniensis" a "Magnosaurus oxoniensis" but this has not been generally followed. Reviews have found it to most likely be a basal tetanuran, probably a megalosaurid. A detailed redescription by Roger Benson in 2010 concluded "Magnosaurus" was valid taxon, a megalosaurid megalosauroid, and at about 175 million years old the oldest certain known member of the Tetanurae. Wiz Science™ is "the" learning channel for children and all ages. SUBSCRIBE TODAY Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK. Background Music: "The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library. This video uses material/images from https://en.wikipedia.org/wiki/Magnosaurus, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.