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出典:『Wikipedia』 (2011/04/01 08:42 UTC 版)

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Angolatitan (or "Angolan giant") is a genus of long-necked, plant eating sauropod dinosaur from Angola. It is known from a partial right arm including a shoulder blade, upper arm (110 centimetres (43 in) long), the two bones of the lower arm (ulna and radius), and three metacarpals. This specimen was found in the Tadi Beds of the Itombe Formation, a Late Turonian-age rock unit (approximately 90 million years old). The discovery was made by Dr Octávio Mateus in 2005, near Iembe, Ambriz, in Bengo Province, a region that would have been underwater at that time. It was named by Octávio Mateus, Louis L. Jacobs, Anne S. Schulp, Michael J. Polcyn, Tatiana S. Tavares, André Buta Neto, Maria Luísa Morais and Micuel T. Antunes in 2011 and the type species is A. adamastor, named after Adamastor, a mythological sea giant. Angolatitan was a basal titanosauriform, more derived than Brachiosaurus but less derived than Euhelopus, which is notable given its relatively late appearance in the sauropod fossil record. It lived in what is thought to have been a desert setting, and is the first dinosaur named from Angola.