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| - In 1907, German paleontologist Eberhard Fraas who was working the Tendaguru Beds in German East Africa (presently Tanzania), discovered two sauropod specimens at a single site ("Quarry A"). The two individuals, designated "Skeleton A" and "Skeleton B", each represented a different sauropod species. In 1908 he named these respectively Gigantosaurus africanus ("African giant lizard") and G. robusta ("Robust giant lizard").[1] A third, unrelated African species, "Gigantosaurus" dixeyi, was named by Haughton in 1928, and has since been re-assigned to Malawisaurus.
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| abstract
| - In 1907, German paleontologist Eberhard Fraas who was working the Tendaguru Beds in German East Africa (presently Tanzania), discovered two sauropod specimens at a single site ("Quarry A"). The two individuals, designated "Skeleton A" and "Skeleton B", each represented a different sauropod species. In 1908 he named these respectively Gigantosaurus africanus ("African giant lizard") and G. robusta ("Robust giant lizard").[1] A third, unrelated African species, "Gigantosaurus" dixeyi, was named by Haughton in 1928, and has since been re-assigned to Malawisaurus. Unfortunately, the name Gigantosaurus had already been used for the European sauropod Gigantosaurus megalonyx Seeley, 1869. Fraas, not intending to place his species in the same genus as this English form, had believed that the name was available, since at the time the latter species was considered to be a junior synonym of Ornithopsis and Seeley in his opinion had not provided a sufficient description anyway. Another German paleontologist, Richard Sternfeld, renamed the Tanzanian sauropod Tornieria in 1911, making the two species Tornieria africana and T. robusta. The generic name honours the German herpetologist Gustav Tornier.[2] A re-evaluation of Tornieria in 1922 by Werner Janensch concluded that one species, T. africana, was actually an African species of the North American sauropod genus Barosaurus: Barosaurus africanus.[3] The other African species, T. robusta, later turned out to belong to a titanosaur. The titanosaur species for a time was called Tornieria, but this was incorrect as T. africana had been the type species. It needed a generic name of its own and this was provided in 1991 when Rupert Wild renamed it Janenschia. If Tornieria were the same genus as Barosaurus, then the name Tornieria would be abandoned as a junior subjective synonym. However, later researchers proposed generic distinction between the American and the African form. In the early 21st century this usage became prevalent and in 2006 Kristian Remes in a review concluded that Tornieria was indeed distinct and a valid genus.[4] A complication is formed by the fact that Janensch in 1961 recognised a variety of B. africanus: B. africanus var. gracilis, a morph distinguished by more gracile hind limbs.[5] In 1980 John McIntosh promoted this to a full species: Barosaurus gracilis[6] which then would become a Tornieria gracilis under the present usage, a combination already published by George Olshevsky in 1992.[7] However, Remes in 2006 concluded that B. gracilis had been a nomen nudum, neither holotype nor diagnosis having been provided in 1980.
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