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Zby, new sauropod from Late Jurassic of Portugal



From: Ben Creisler
bcreisler@gmail.com

A new dinosaur in the new Journal of Vertebrate Paleontology:


Octávio Mateus, Philip D. Mannion & Paul Upchurch (2014)
Zby atlanticus, a new turiasaurian sauropod (Dinosauria, Eusauropoda)
from the Late Jurassic of Portugal.
Journal of Vertebrate Paleontology 34(3): 618-634
DOI:10.1080/02724634.2013.822875
http://www.tandfonline.com/doi/full/10.1080/02724634.2013.822875#.U2lVhPldXeI

Here we describe a new partial sauropod skeleton from the late
Kimmeridgian (Late Jurassic) of the Lourinhã Formation, central west
Portugal. The closely associated specimen comprises a complete tooth
(with root), a fragment of cervical neural arch, an anterior chevron,
and an almost complete right pectoral girdle and forelimb. The new
sauropod, Zby atlanticus, n. gen. et sp., can be diagnosed on the
basis of four autapomorphies, including a prominent posteriorly
projecting ridge on the humerus at the level of the deltopectoral
crest. Nearly all anatomical features indicate that Zby is a
non-neosauropod eusauropod. On the basis of several characters,
including tooth morphology, extreme anteroposterior compression of the
proximal end of the radius, and strong beveling of the lateral half of
the distal end of the radius, Zby appears to be closely related to
Turiasaurus riodevensis from approximately contemporaneous deposits in
eastern Spain. However, these two genera can be distinguished from
each other by a number of features pertaining to the forelimb. Whereas
previously described Late Jurassic Portuguese sauropods show close
relationships with taxa from the contemporaneous Morrison Formation of
North America, it appears that turiasaurians were restricted to
Europe. All adult sauropods recovered in the Late Jurassic of Portugal
thus far are very large individuals: it is possible that the apparent
absence of small- or medium-sized adult sauropods might be related to
the occupation of lower-browsing niches by non-sauropods such as the
long-necked stegosaur Miragaia longicollum.