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The first giant titanosaurian sauropod from the Upper Cretaceous of North America
in case you haven't read it yet:
Fowler, D. W. & Sullivan, R. M. In press. The first giant
titanosaurian sauropod from the Upper Cretaceous of North America.
Acta palaeontologica Polonica.
ABSTRACT: Argentinosaurus (Cenomanian, Argentina) is generally
accepted as being the largest dinosaur so far discovered and is one of
several giant titanosaurian sauropods known from the Upper Cretaceous
of South America and Asia, but suprisingly not from North America.
Here we present the first evidence of giant titanosaurian sauropods
from the Upper Cretaceous of North America: two enormous vertebrae and
a partial femur, from the Naashoibito Member of the Ojo Alamo
Formation, New Mexico, and referred to Alamosaurus sanjuanensis. One
of the new vertebrae, a posterior cervical, is comparable in size to a
posterior cervical described for Puertasaurus: an
Argentinosaurus-sized titanosaurian from the Maastrichtian of
Argentina. This makes A. sanjuanensis the largest dinosaur from North
America, and among the largest in the world. These findings indicate
that A. sanjuanensis is diagnosed based on immature remains, which may
have implications for cladistic analyses.