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Fwd: Zaraapelta, new ankylosaur from Late Cretaceous of Mongolia

A news release:


---------- Forwarded message ----------
From: Ben Creisler <bcreisler@gmail.com>
Date: Mon, Oct 27, 2014 at 9:36 AM
Subject: Zaraapelta, new ankylosaur from Late Cretaceous of Mongolia
To: dinosaur@usc.edu

Ben Creisler

A new paper:

Victoria M. Arbour, Philip J. Currie and Demchig Badamgarav (2014)
The ankylosaurid dinosaurs of the Upper Cretaceous Baruungoyot and
Nemegt formations of Mongolia.
Zoological Journal of the Linnean Society 172(3): 631–652
DOI: 10.1111/zoj.12185

The discovery of a new ankylosaurid skull with some unusual features
from the Baruungoyot Formation of Mongolia prompted a systematic
review of ankylosaurid specimens from the Baruungoyot and Nemegt
formations. Dyoplosaurus giganteus was found to possess no diagnostic
features and is regarded as a nomen dubium. The holotype of Tarchia
kielanae (previously synonymized with Tarchia gigantea) has one
autapomorphy, an accessory postorbital ossification with surrounding
furrow, and Tar. kielanae is here considered a valid species, making
the combination Tar. gigantea unnecessary. An accessory postorbital
ossification is also found in the holotype of Minotaurasaurus
ramachandrani, and this species is here considered a junior synonym of
Tar. kielanae. The newly described skull from the Baruungoyot
Formation forms the holotype of a new genus and species, Zaraapelta
nomadis gen. et sp. nov., diagnosed by unusual bilayered ornamentation
on the squamosal horn and extensive postocular ornamentation. Two
distinct tail club handle morphotypes are present in the Nemegt
Formation and probably represent two different species. However, it is
impossible to assign either tail club morphotype to the single valid
species from the formation, Saichania chulsanensis, because of a lack
of overlapping material. A revised phylogenetic analysis including
newly identified characters found Zaraapelta nomadis to be most
closely related to Tar. kielanae.