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. 2016; 11(5):e0154218.Plos

Abstract

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.

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Authors+Show Affiliations

Mallon JC

Palaeobiology, Canadian Museum of Nature, PO Box 3443 Station "D", Ottawa, Ontario, K1P 6P4, Canada.

Ott CJ

Independent Researcher, PO Box 1515, Appleton, Wisconsin, 54912, United States of America.

Larson PL

Black Hills Institute, 217 Main Street, Hill City, South Dakota, 57745, United States of America.

Iuliano EM

Kadlec Medical Center, 888 Swift Boulevard, Richland, Washington, 99352, United States of America.

Evans DC

Department of Natural History, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, M5S 2C6, Canada.

MeSH

AnimalsDinosaursEvolution, MolecularFossilsGeographyMontanaPhylogenySkeleton

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27191389

Citation

Mallon, Jordan C., et al. "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, vol. 11, no. 5, 2016, pp. e0154218.

Mallon JC, Ott CJ, Larson PL, et al. 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. 2016;11(5):e0154218.

Mallon, J. C., Ott, C. J., Larson, P. L., Iuliano, E. M., & Evans, D. C. (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. https://doi.org/10.1371/journal.pone.0154218

Mallon JC, et al. 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. 2016;11(5):e0154218. PubMed PMID: 27191389.

* Article titles in AMA citation format should be in sentence-case

TY - JOUR T1 - 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. AU - Mallon,Jordan C, AU - Ott,Christopher J, AU - Larson,Peter L, AU - Iuliano,Edward M, AU - Evans,David C, Y1 - 2016/05/18/ PY - 2016/01/29/received PY - 2016/04/11/accepted PY - 2016/5/19/entrez PY - 2016/5/19/pubmed PY - 2017/7/25/medline SP - e0154218 EP - e0154218 JF - PloS one JO - PLoS One VL - 11 IS - 5 N2 - 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. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/27191389/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_ DB - PRIME DP - Unbound Medicine ER -

Tags

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. 2016; 11(5):e0154218.Plos