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A new Brazilian titanosaur
A NEW TITANOSAUR FROM WESTERN SÃO PAULO STATE, UPPER CRETACEOUS BAURU
GROUP, SOUTH-EAST BRAZIL
SANTUCCI, RODRIGO MILONI1; BERTINI, REINALDO J.
Material from a new titanosaur from the Bauru Basin (Bauru Group),
Brazil is described and compared with well-known titanosaurs.
Adamantisaurus mezzalirai gen. et sp. nov. is based on six articulated
anterior caudal vertebrae and two haemapophyses collected from the
Adamantina Formation, which is considered to be
Campanian–Maastrichtian? in age. Adamantisaurus mezzalirai is
characterized by the following combination of characteristics:
anterior caudal vertebrae with straight or slightly
backwardly-projecting neural spines with strongly expanded distal
ends, stout prespinal lamina, very wide pre- and postzygapophyseal
articular facets, and concave postzygapophyseal articular facets on
anterior caudal vertebrae. Although our cladistic analysis has
produced equivocal results, Adamantisaurus mezzalirai shares with DGM
'Series B' (Peirópolis titanosaur) and Aeolosaurus the presence of
postzygapophyses with concave articular facets, and shares with DGM
'Series B' the presence of laterally expanded neural spines and stout
prespinal lamina. Additionally, A. mezzalirai shares with DGM 'Series'
C (other titanosaur from Peirópolis) the presence of short neural