DINOWEB - dinosaurs web-site  

Complete Data Base of Paleozoic and Mesozoic Tetrapods.
Paleo-News and illustrations. Big electronic PDF-library.

 
line decor
  
line decor

Download PDF Paleolibrary
 

 

*
?????????? ?????????
сайт о динозаврах
??????? ?????????

рейтинг сайтов
Free Hit Counters

Free Counter
hit counter javascript

myspace hit counter
Powered by counter.bloke.com

Locations of visitors to this page

 
 

Spiclypeus shipporum gen. et sp. nov., a Boldly Audacious New Chasmosaurine Ceratopsid (Dinosauria: Ornithischia) from the Judith River Formation (Upper Cretaceous: Campanian) of Montana, USA.

May 21, 2016

This study reports on a new ceratopsid, Spiclypeus shipporum gen et sp. nov., from the lower Coal Ridge Member of the Judith River Formation in Montana, USA, which dates to ~76 Ma (upper Campanian). The species is distinguished by rugose dorsal contacts on the premaxillae for the nasals, laterally projecting postorbital horncores, fully fused and anteriorly curled P1 and P2 epiparietals, and a posterodorsally projecting P3 epiparietal. The holotype specimen is also notable for its pathological left squamosal and humerus, which show varied signs of osteomyelitis and osteoarthritis. Although the postorbital horncores of Spiclypeus closely resemble those of the contemporaneous ‘Ceratops’, the horncores of both genera are nevertheless indistinguishable from those of some other horned dinosaurs, including Albertaceratops and Kosmoceratops; ‘Ceratops’ is therefore maintained as a nomen dubium. Cladistic analysis recovers Spiclypeus as the sister taxon to the clade Vagaceratops + Kosmoceratops, and appears transitional in the morphology of its epiparietals. The discovery of Spiclypeus adds to the poorly known dinosaur fauna of the Judith River Formation, and suggests faunal turnover within the formation.

Jordan C. Mallon, Christopher J. Ott, Peter L. Larson, Edward M. Iuliano & David C. Evans (2016)
Spiclypeus shipporum gen. et sp. nov., a Boldly Audacious New Chasmosaurine Ceratopsid (Dinosauria: Ornithischia) from the Judith River Formation (Upper Cretaceous: Campanian) of Montana, USA.
PLoS ONE 11(5): e0154218.
doi:10.1371/journal.pone.0154218


 



 
             
Hosted by uCoz