[dinosaur] Ankylosaur osteoderms from Upper Cretaceous of Argentina

Ben Creisler
[email protected]


A new paper:


Alejandro Murray, Facundo Riguetti & Sebastián Rozadilla (2019)
New ankylosaur (Thyreophora, Ornithischia) remains from the Upper
Cretaceous of Patagonia.
Journal of South American Earth Sciences (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.jsames.2019.102320&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=ACbztjtXDFVSluTyZ5WM4Pc2Y8yGeztHFWDSz1adznk&s=RT2CP5txNPCoP7kW91AapnC-1kWwDt6mNiVTfsr1QcY&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S0895981119302755&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=ACbztjtXDFVSluTyZ5WM4Pc2Y8yGeztHFWDSz1adznk&s=tuqywhuLtSYFX6MpiYfk-bpthToZ341otmcWVHZ_qnM&e= 

Highlights

"We report and describe new materials of Ankylosauria from Patagonia.".
"The ankylosaur materials come from the Allen Formation
(Campanian-Maastrichtian)".
"The recovered remains represent osteoderms of three different morphotypes
that resembles those of nodosaurids".
"Ankylosaurs are extremely rare in Gondwana and the new materials shed
light on its diversity".

Abstract

Fossil evidences of the presence of ankylosaurian dinosaurs in Gondwana are
scarce but consistent, being found in Antarctica, Oceania and South
America. In spite that there are no nominated species in South America, the
ankylosaur fossil record has increased in the last years. Indeterminate
nodosaurid specimens, some isolated osteoderms and many trackways are known
from the Upper Cretaceous of South America. The aim of the present
contribution is to report new ankylosaurian remains from the Allen
Formation (Campanian-Maastrichtian) at the Salitral Moreno locality,
Northern Patagonia, Argentina. These osteoderms are small and conical, and
includes thoracic, sacral and caudal scutes. The thoracic and sacral pieces
are similar to those belonging to nodosaurids. The caudal osteoderm is a
new element for the record of South American ankylosaurs. It resembles the
caudal plates of Kunbarrasaurus and some ankylosaurids. The scutes show a
mixture of characters so it is not possible to assign these pieces to a
nodosaurid-like or ankylosaurid ankylosaur. These elements are consistent
with the previously known ankylosaur fossil record of the Upper Cretaceous
of Argentina, being a new sample of the diversity of the latest Cretaceous
from South America.


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