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Judiceratops, new ceratopsian from the Judith River Formation of Montana.



From: Ben Creisler
bcreisler@gmail.com

A new paper with new dinosaur genus:


Nicholas R. Longrich (2013)
Judiceratops tigris, a New Horned Dinosaur from the Middle Campanian
Judith River Formation of Montana.
Bulletin of the Peabody Museum of Natural History 54(1):51-65. 2013
doi: http://dx.doi.org/10.3374/014.054.0103
http://www.bioone.org/doi/abs/10.3374/014.054.0103



North America hosted a diverse assemblage of horned dinosaurs from the
late Campanian until the end of the Cretaceous, but comparatively
little is known about earlier horned dinosaurs. This paper reports on
previously undescribed ceratopsian remains from the middle Campanian
beds of the Judith River Formation of Montana, which represent the
oldest known chasmosaurine. The Judith River chasmosaur shows a
combination of characters not seen in any previously described
ceratopsid. The parietal has a broad median bar, a rounded caudal
margin, and highly reduced epiparietals. Episquamosals are enlarged
anteriorly but decrease in size posteriorly, and imbricate as in
centrosaurines. The postorbital horns are moderately elongate,
inclined anterolaterally, and have an unusual teardrop-shaped cross
section. The unique combination of characters seen in the Judith River
chasmosaurine precludes referral to any previously known genus, and it
is therefore described as a new genus and species, Judiceratops
tigris. The addition of Judiceratops to the dinosaurian fauna of North
America underscores the diversity of horned dinosaurs in the Late
Cretaceous, which results from a combination of high diversity within
faunas, a high degree of endemism, and rapid faunal turnover.