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Machairoceratops is an extinct genus of centrosaurine ceratopsian extinct dinosaur known from the Late Cretaceous Wahweap Formation (late Campanian stage) of Grand Staircase-Escalante National Monument, southern Utah, United States. Machairoceratops meaning "bent sword horned face" as a reference to the two horns projecting from the top of the frill. The species Machairoceratops cronusi is named after greek titan Cronus, who deposed his father Uranus by castrating him with a sickle or scythe. Machairoceratops was found in 2006 and was officially declared a new genus in 2016 by Eric K. Lund, Patrick M O'Connor, Mark A. Loewen, and Zubair A. Jinnah.

Phylogeny

Lund et al. (2016) tested the position of Machairoceratops within Centrosaurinae by performing maximum parsimony and Bayesian phylogenetic species level analyses. The maximum parsimony analysis yielded a large polytomy at the base of Centrosaurinae, with only Centrosaurini, most of Pachyrhinosaurini (EiniosaurusWendiceratops and Pachyrostra), and a clade formed by Avaceratops and Nasutoceratops being resolved. The Bayesian analysis yielded a fully resolved topology which is shown below.

Ceratopsidae 
   Chasmosaurinae
  
 Centrosaurinae 
  
   Machairoceratops cronusi
  
  
  
   Albertaceratops nesmoi
  
   Diabloceratops eatoni
  
  
  
   Avaceratops lammersi
  
   Nasutoceratops titusi
  
  
  
  
  
 Centrosaurini 
  
   Rubeosaurus ovatus
  
   Styracosaurus albertensis
  
  
  
   Spinops sternbergorum
  
  
   Centrosaurus apertus
  
   Coronosaurus brinkmani
  
  
  
  
 Pachyrhinosaurini 
  
   Xenoceratops foremostensis
  
   Sinoceratops zhuchengensis
  
  
  
   Wendiceratops pinhornensis
  
 Pachyrostra 
  
   Einiosaurus procurvicornis
  
   Achelousaurus horneri
  
  
  
   Pachyrhinosaurus canadensis
  
  
   Pachyrhinosaurus lakustai
  
   Pachyrhinosaurus perotorum
  
  
  
  
  
  
  
  


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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: †Ornithischia
Family: †Ceratopsidae
Subfamily: †Centrosaurinae
Genus: Machairoceratops

Lund et al., 2016

Type species
Machairoceratops cronusi

Lund et al., 2016

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