Crittendenceratops

Crittendenceratops (meaning "horned face from the Fort Crittenden Formation") is a genus of horned centrosaurine ceratopsid dinosaur from the late Campanian Fort Crittenden Formation of Arizona. It contains a single species, C. krzyzanowskii, and represents the first species of dinosaur from the Fort Crittenden Formation to receive a formal scientific name.

Crittendenceratops Temporal range: Campanian, 73 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Life reconstruction of C. krzyzanowskii
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Family:	†Ceratopsidae
Subfamily:	†Centrosaurinae
Tribe:	†Nasutoceratopsini
Genus:	†Crittendenceratops Dalman et al., 2018
Species:	†C. krzyzanowskii
Binomial name
†Crittendenceratops krzyzanowskii Dalman et al., 2018

Description

Size of Crittendenceratops compared to a human

Crittendenceratops is distinguished by forward-curving, hook-like flanges located along the central portion of the top of the frill, "extensive" epiparietals located along the sides of the parietal portion of the frill, a thickening of the frill in the parietal portion, and a short, pronounced ridge on the surface of the squamosal portion of the frill.^[1]

Classification

Crittendenceratops was assigned to the Nasutoceratopsini (which also includes Avaceratops, Nasutoceratops, and Yehuecauhceratops), a tribe of the ceratopsid subfamily Centrosaurinae, by Dalman et al. (2018). The cladogram below follows their phylogenetic analysis:^[1]

Diabloceratops eatoni Centrosaurinae Nasutoceratopsini Yehuecauhceratops mudei Nasutoceratops titusi Avaceratops lammersi MOR 692 CMN 8804 Crittendenceratops krzyzanowskii 'Malta centrosaurine' Albertaceratops nesmoi Medusaceratops lokii Sinoceratops zhuchengensis Wendiceratops pinhornensis Machairoceratops cronusi Eucentrosaura Einiosaurus procurvicornis Achelousaurus horneri Pachyrhinosaurus perotorum Pachyrhinosaurus lakustai Pachyrhinosaurus canadensis Centrosaurini Coronosaurus brinkmani Xenoceratops foremostensis Spinops sternbergorum Centrosaurus apertus Rubeosaurus ovatus Styracosaurus albertensis

See also

• Timeline of ceratopsian research
• 2018 in archosaur paleontology

References

1. Dalman, Sebastian G.; Hodnett, John-Paul M.; Lichtig, Asher J.; Lucas, Spencer G. (2018). "A new ceratopsid dinosaur (Centrosaurinae: Nasutoceratopsini) from the Fort Crittenden Formation, Upper Cretaceous (Campanian) of Arizona". New Mexico Museum of Natural History and Science Bulletin. 79: 141–164.