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Ingentia is a genus of early sauropod dinosaur from the Late Triassic (late Norian-Rhaetian) of Argentina. The type specimen of Ingentia, PVSJ 1086, was discovered in the Quebrada del Barro Formation of northwestern Argentina. It was described in 2018 by Cecilia Apaldetti, Ricardo Nestor Martínez, Ignacio Alejandro Cerda, Diego Pol and Oscar Alcober who named the type and only species Ingentia prima, meaning "first huge one", as the taxon was one of the first very large sauropodomorphs to evolve, along with its close relative Lessemsaurus. A second specimen, PVSJ 1087, was referred, containing five tail vertebrae, both ulnae and radii, a left calfbone and a right foot.
Classification

A phylogenetic analysis performed by Apaldetti et al. found a new clade uniting Ingentia, Lessemsaurus and Antetonitrus, which they named Lessemsauridae. Like other lessemsaurids, Ingentia has highly pneumatic and very antero-posteriorly short but tall robust cervical vertebrae, a very expanded distal scapula blade, and arms that are relatively bent but capable of supporting the torso. Depending on the definition of Sauropoda, the clade is either the oldest sauropod taxon, or the sister taxon of the clade Sauropoda. The phylogenetic analysis is shown below:[1]

Sauropodiformes

Mussaurus

Aardonyx

Sefapanosaurus

Melanorosauridae

Camelotia

Melanorosaurus

Sauropoda
Lessemsauridae

Antetonitrus

Ingentia

Lessemsaurus

Blikanasaurus

Gongxianosaurus

Pulanesaura

Gravisauria



See also

2018 in paleontology

References

Apaldetti, Cecilia; Martínez, Ricardo N.; Cerda, Ignatio A.; Pol, Diego; Alcober, Oscar (2018). "An early trend towards gigantism in Triassic sauropodomorph dinosaurs". Nature Ecology & Evolution. 2 (8): 1227–1232. doi:10.1038/s41559-018-0599-y. hdl:11336/89332. PMID 29988169.

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