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Temporal range: Late Jurassic, 152Ma
Antunes & Mateus, 2003
|Species:||† L. atalaiensis|
(Lapparent & Zbyszewski, 1957 [originally Brachiosaurus])
Brachiosaurus atalaiensis Lapparent & Zbyszewski, 1957
In 1947 Manuel de Matos, a member of the Geological Survey of Portugal, discovered large sauropod fossils in the Portuguese Lourinhã Formation that date back to the Tithonian stage of the Late Jurassic period. In 1957 Albert-Félix de Lapparent and Georges Zbyszewski named the remains as a new species of Brachiosaurus: Brachiosaurus atalaiensis. The specific name referred to the site Atalaia. In 2003 Octávio Mateus and Miguel Telles Antunes renamed a separate genus: Lusotitan. The type species is Lusotitan atalaiensis. The generic name is derived from Luso, the Latin name for an inhabitant of Lusitania, and Greek Titan a mythological giant.
The finds consisted of a partial skeleton lacking the skull and individual vertebrae uncovered in several locations. De Lapparent did not assign a holotype. In 2003 Mateus chose the skeleton as the lectotype. Its bones have the inventory numbers MIGM 4798, 4801-10, 4938, 4944, 4950, 4952, 4958, 4964-6, 4981-2, 4985, 8807, and 8793-5. These remains include 28 vertebrae and elements of the appendicular skeleton.
It has been estimated that Lusotitan was 25 meters (82 feet) long. It had long forearms, one of the reasons Mateus assigned it to the Brachiosauridae.
The holotype was re-described by Mannion and colleagues in 2013.
The Lourinhã Formation likely formed sometime in the Kimmeridgian or Tithonian ages and is coastal with a strong marine influence. Its flora and fauna are similar to the Morrison. Lusotitan is currently the largest dinosaur that has been discovered in the area, and the Torvosaurus is the top predator in the region. The Lusotitan lived alongside European species of Allosaurus (A. europaeus), Ceratosaurus, and the theropod predator Lourinhanosaurus, in addition to the diplodocid sauropods Dinheirosaurus and Lourinhasaurus. Dacentrurus and Miragaia were both stegosaurs, while Dracopelta was an ankylosaurian. Draconyx was an iguanadon.
- Antunes, Miguel; Mateus, Octavio (2003). "Dinosaurs of Portugal". Comptes Rendus Palevol 2 (1): 77–95. doi:10.1016/S1631-0683(03)00003-4. Retrieved 2008-07-06.
- A.F. de Lapparent & G. Zbyszewski, 1957, "Les dinosauriens du Portugal", Mémoires des Services Géologiques du Portugal, nouvelle série 2: 1-63
- Mannion, P. D., Upchurch P., Barnes R. N., & Mateus O. (2013). Osteology of the Late Jurassic Portuguese sauropod dinosaur Lusotitan atalaiensis (Macronaria) and the evolutionary history of basal titanosauriforms. Zoological Journal of the Linnean Society. 1-109.
- Octávio Mateus. Late Jurassic dinosaurs from the Morrison Formation (USA) included the Lourinhã and Alcobaça Formations (Portugal), and the Tendaguru Beds (Tanzania). Foster, J.R. and Lucas, S. G. R.M., eds., 2006, Paleontology and Geology of the Upper Jurassic Morrison Formation. New Mexico Museum of Natural History and Science Bulletin 36.
- Brachiosauridae from Thescelosaurus!