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Trinisaura, new Cretaceous ornithopod from Antarctica



From: Ben Creisler
bcreisler@gmail.com


A new online paper:

Rodolfo A. Coria, Juan J. Moly, Marcelo Reguero, Sergio Santillana &
Sergio Marenssi (2013)
A new ornithopod (Dinosauria; Ornithischia) from Antarctica.
Cretaceous Research (advance online publication)
http://dx.doi.org/10.1016/j.cretres.2012.12.004
http://www.sciencedirect.com/science/article/pii/S0195667112001784


A new ornithopod dinosaur from Antarctica, Trinisaura santamartaensis
n. gen. et n. sp. is diagnosed by a unique combination of characters
that includes a scapula with a spike-like acromial process with a
strong and sharp lateral crest and longer than other ornithopods, a
humerus with a rudimentary deltopectoral crest represented as a
thickening on the anterolateral margin of the humerus, and shaft
strongly bowed laterally, and an ischium gently curved along its
entire length. The holotype specimen comprises vertebral and
appendicular elements. The presence of axially elongate distal caudal
vertebrae, pubis with long prepubic and postpubic processes, as well
as a femur with a distinct anterior trochanter, pendant 4th trochanter
and shallow anterior intercondylar groove constitute a combination of
characters present in the Late Cretaceous Patagonian Gasparinisaura,
Anabisetia and Talenkahuen. The materials were found on the surface
enclosed in a hard sandstone concretion collected near the Santa Marta
Cove, James Ross Island, from the lower levels of the Snow Hill Island
Formation (Campanian). This is the first ornithopod taxon identified
from this unit, and the second ornithischian dinosaur, after the
ankylosaur Antarctopelta oliveroi. However, other ornithopod reports
from nearby localities of James Ross and Vega islands in outcrops of
the overlying Lopez de Bertodano Formation suggest that this clade was
widely represented in the Campanian and Maastrichtian of the James
Ross Basin, Antarctic continent.

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Highlights


► We describe a new Ornithopoda dinosaur from Antarctica, Trinisaura
santamartaensis. ► Trinisaura increases our knowledge about the
Antarctic dinosaur diversity. ► Trinisaura is the first Ornithopoda
species identified from the Snow Hill Island Formation. ► Trinisaura
and other Ornithopoda reports suggest predominance of this group in
Antarctica.