Bernardo
González Riga y Leonardo Ortíz David
Quetecsaurus
rusconii gen. et sp. nov. is a new titanosaur (Dinosauria,
Sauropoda) from the Neuquén Basin of Mendoza Province, Argentina. The specimen
comes from red mudstones of the Cerro Lisandro Formation (middle-late Turonian,
Upper Cretaceous), and is the first sauropod with well-preserved remains to be
discovered in this formation. The holotype includes a postorbital, teeth, the
atlas, a posterior cervical vertebra, an incomplete dorsal vertebra, a
posterior caudal centrum, dorsal ribs, a coracoid, fragments of a humerus,
radius and ulna, and five metacarpals. It is characterized by the following
combination of autapomorphies: (1) intercentrum of atlas with a prominent anteroventral
border and expanded posteroventral processes; (2) posterior cervical neural
spines with incipient lateral expansions; and (3) humerus with strongly sigmoid
proximal border, rounded proximomedial border, and angular proximolateral
corner. A preliminary cladistic analysis placed Quetecsaurus as a sister taxon
of Lognkosauria (Mendozasaurus + Futalognkosaurus). Quetecsaurus shares with
the lognkosaurs the presence of cervical neural spines with ‘lateral laminae’,
but relatively reduced in comparison with those taxa. This discovery provides
new information on the diagnosis of Lognkosauria within South American
titanosaurs.
González Riga, B. y
Ortíz David, L. 2014.A New titanosaur (Dinosauria, Sauropoda) from the Upper
Cretaceous (Cerro Lisandro Formation) of Mendoza Province, Argentina.
Ameghiniana 51(1):3-25.
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