Centrosaurinae

Centrosaurines; Temporal range: Late Cretaceous, ;
	Centrosaurus "nasicornus" skeleton, Palaeontological Museum Munich
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Ceratopsia
Family:	†Ceratopsidae
Subfamily:	†Centrosaurinae; Lambe, 1915
Type species
	†Centrosaurus apertus; Lambe, 1904
Subgroups
	†Albertaceratops; †Brachyceratops?; †Diabloceratops; †Machairoceratops; †Medusaceratops; †Menefeeceratops; †Sinoceratops; †Wendiceratops; †Xenoceratops; †Monoclonius; †Nasutoceratopsini †Avaceratops; †Crittendenceratops; †Furcatoceratops; †Nasutoceratops; †Yehuecauhceratops; ; †Eucentrosaura †Centrosaurini †Centrosaurus; †Coronosaurus; †Spinops; †Styracosaurus?; ; †Pachyrhinosaurini; ;
Synonyms
	Pachyrhinosaurinae Sternberg, 1950; Monocloniinae Nopcsa, 1923;

Centrosaurinae (from the Greek, meaning "pointed lizards") is a subfamily of ceratopsid, a group of large quadrupedal ornithischian dinosaur. Centrosaurine fossil remains are known primarily from the northern region of Laramidia (modern day Alberta, Montana, and Alaska) but isolated taxa have been found in China and Utah as well.

Defining features of centrosaurines include a large nasal horn, short supratemporal horns, and an ornamented frill projecting from the back of the skull. With the exception of Centrosaurus apertus, all adult centrosaurines have spike-like ornaments midway up the skull. Morphometric analysis shows that centrosaurines differ from other ceratopsian groups in skull, snout, and frill shapes. There is evidence to suggest that male centrosaurines had an extended period of adolescence, and sexual ornamentation did not appear until adulthood.

Centrosaurinae was named by paleontologist Lawrence Lambe in 1915, with Centrosaurus as the type genus. The centrosaurines are further divided into three tribes: the Nasutoceratopsini, the Centrosaurini, and the Pachyrhinosaurini by Ryan et al (2016). Nasutoceratopsins are defined as centrosaurines closer to Nasutoceratops titusi than to Centrosaurus apertus and centrosaurins are defined as centrosaurines (more specifically eucentrosaurans) closer to Centrosaurus apertus than to Pachyrhinosaurus canadensis. Until 2016, the only division used was Pachyrhinosaurini, which is defined as centrosaurines closer to Pachyrhinosaurus canadensis than to Centrosaurus apertus.

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