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Tuarangisaurus? (elasmosaurid plesiosaur) from Upper Maastrichtian of Argentina



From: Ben Creisler
bcreisler@gmail.com

A new paper not yet mentioned:

José P. O'Gorman, Zulma Gasparini & Leonardo Salgado [2014]
Reappraisal of Tuarangisaurus? cabazai (Elasmosauridae, Plesiosauria)
from the Upper Maastrichtian of northern Patagonia, Argentina.
Cretaceous Research 47: 39–47
http://dx.doi.org/10.1016/j.cretres.2013.10.003
http://www.sciencedirect.com/science/article/pii/S0195667113001560


The holotype of Tuarangisaurus? cabazai Gasparini, Salgado and
Casadio, 2003 (Elasmosauridae, Plesiosauria) from the Upper
Maastrichtian Jagüel Formation (northern Patagonia, Argentina) is
redescribed, its taxonomic status is reconsidered, and its
phylogenetic relationships analysed. We conclude that it must be
referred as an aristonectin elasmosaurid. The complete ilium of an
Aristonectinae is described for the first time, and reveals a
distinctive proximodistally elongated facet in its distal end.
Aristonectins are the most commonly recorded Weddellian elasmosaurids.
There is a high proportion of osteologically immature individuals
(“juveniles”) within the investigated sample of specimens. Most of
these are larger than other juvenile elasmosaurids, and apparently
retain juvenile features at larger body sizes.