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.



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.

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

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