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Machairoceratops cronusi

Osteichthyes - Ceratopsidae

Taxonomy
Machairoceratops cronusi was named by Lund et al. (2016). Its type specimen is UMNH VP 20550, a partial skull, and it is a 3D body fossil. Its type locality is UMNH VP Loc. 1654, Star Seep, which is in a Campanian terrestrial mudstone in the Wahweap Formation of Utah. It is the type species of Machairoceratops.

Synonymy list
YearName and author
2016Machairoceratops cronusi Lund et al. p. 8

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
RankNameAuthor
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Marginocephalia
—Ceratopsia()
familyCeratopsidae
subfamilyCentrosaurinae
genusMachairoceratops
speciescronusi

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Machairoceratops cronusi Lund et al. 2016
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Diagnosis
ReferenceDiagnosis
E. K. Lund et al. 2016Centrosaurine ceratopsid diagnosed by the following autapomorphies: posteriorly projecting, anteriorly curved spike-like epiparietal loci (p1) ornamentation, that also exhibits a posteromedially directed sulcus along the entire length of the epiparietal differing from all other sulci present on ceratopsian epiossifications in width, depth, and overall conformation. Machairoceratops differs from the stratigraphically lower Diabloceratops in a number of key features including: a fan-shaped, subrectangular (rather than rectangular) stepped squamosal, an inferred (based on size and shape of the epijugal contact facet) smaller, elliptical (rather than tetrahedral) epijugal, two anterodorsally (rather than laterally) curved (p1) epiparietals on either side of a midline embayment, and a posteromedially oriented sulcus running the entire length of the posterior surface of the epiparietal loci (p1) ornamentation. Additionally, Machairoceratops differs from several roughly contemporaneous centrosaurines from the northern portion of Laramidia (e.g., Albertaceratops nesmoi, Coronosaurus brinkmani, and Spinops sternbergorum) in possessing a triangular (rather than rounded) parietosquamosal frill, and in the morphology and orientation of the epiparietal ornamentation as described above.
Measurements
No measurements are available
Composition: hydroxyapatiteo
Entire body: yeso
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: gregariouso
Environment: terrestrialsubo
Locomotion: actively mobileo
Life habit: ground dwellingsubo
Diet: herbivoresubo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2005-09-15 11:08:09
Modified: 2005-09-15 13:08:09
Source: subo = suborder, o = order
References: Norman and Weishampel 1991, Kiessling 2004, Marsh 1875

Age range: Middle Campanian or 83.60000 to 72.20000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Middle Campanian83.6 - 72.2USA (Utah) Centrosaurinae indet. (type locality: 178847)