Centrosaurinae

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Centrosaurines
Temporal range: Late Cretaceous, 80.8–66 Ma
Paläontologisches Museum in München Monoclonius.JPG
Centrosaurus nasicornus skeleton, Palaeontological Museum Munich
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Family: Ceratopsidae
Subfamily: Centrosaurinae
Lambe, 1915
Type species
Centrosaurus apertus
Lambe, 1904
Subgroups
Synonyms
  • Pachyrhinosaurinae Sternberg, 1950

Centrosaurinae (Greek: sharp pointed lizards) is a subfamily of ceratopsid dinosaurs, a group of large quadrupedal ornithiscians. 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).[1] The only division used up until then was Pachyrhinosaurini. 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.[2] Defining features of centrosaurines include a large nasal horn, short supratemporal horns, and an ornamented frill projecting from the back of the skull.[3] With the exception of Centrosaurus apertus, all adult centrosaurines have spike-like ornaments midway up the skull.[4] Morphometric analysis shows that centrosaurines differ from other ceratopsian groups in skull, snout, and frill shapes.[5] There is evidence to suggest that male centrosaurines had an extended period of adolescence and sexual ornamention did not appear until adulthood.[3]

Classification[edit]

The cladogram presented here follows a 2017 phylogenetic analysis by Rivera-Sylva et al..[6]

Centrosaurinae

Diabloceratops eatoni



Nasutoceratopsini

Avaceratops lammersi



Nasutoceratops titusi



Yehuecauhceratops mudei





Xenoceratops foremostensis





Sinoceratops zhuchengensis



Wendiceratops pinhornensis




Albertaceratops nesmoi



Centrosaurini

Rubeosaurus ovatus



Styracosaurus albertensis



Coronosaurus brinkmani




Centrosaurus apertus



Spinops sternbergorum




Pachyrhinosaurini

Einiosaurus procurvicornis




Achelousaurus horneri




Pachyrhinosaurus canadensis



Pachyrhinosaurus lakustai



Pachyrhinosaurus perotorum










The cladogram presented below follows a phylogenetic analysis by Chiba et al. (2017):[7]

Centrosaurinae


Diabloceratops eatoni



Machairoceratops cronusi




Nasutoceratopsini

Avaceratops lammersi (ANSP 15800)



MOR 692



CMN 8804



Nasutoceratops titusi



Malta new taxon





Xenoceratops foremostensis





Sinoceratops zhuchengensis



Wendiceratops pinhornensis




Albertaceratops nesmoi



Medusaceratops lokii


Eucentrosaura
Centrosaurini


Rubeosaurus ovatus



Styracosaurus albertensis





Coronosaurus brinkmani




Centrosaurus apertus



Spinops sternbergorum





Pachyrhinosaurini

Einiosaurus procurvicornis


Pachyrostra

Achelousaurus horneri




Pachyrhinosaurus canadensis




Pachyrhinosaurus lakustai



Pachyrhinosaurus perotorum











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Biogeography[edit]

Centrosaurine fossils have mostly been found in Western North America (Alberta, Montana, & Alaska).[2] Two taxa, Diabloceratops and Machairoceratops, have been found as far south as Utah and non-diagnostic material has been found in New Mexico and Mexico as well.[2] No centrosaurine fossils had been uncovered outside Western North America until 2010 when Sinoceratops zhuchengensis was discovered in the Shandong Province of China.[8] Some authors question the placement of Sinoceratops within Centrosaurinae, however. All other Late Cretaceous dinosaur groups from North America have been found in Asia as well so the initial absence of Asian centrosaurines had been surprising.[8] The current evidence suggests that Centrosaurinae originated in Laramidia 90-80 million years ago.[2] This means Sinoceratops would have migrated to China from North America.[1] Some hypothesize that centrosaurines originated in the south Laramidia and only later radiated north.[9]

Body Size[edit]

Compared to their sister group, Chasmosaurinae, centrosaurines are relatively small. The primitive Sinoceratops zhuchengensis is an exception, with an estimated skull length of 180 cm.[8] By contrast, the skull length of Albertoceratops was more typical for this group at only 67 cm.[4] In general, centrosaurines were about the size of a rhinoceros with body lengths ranging from 2.5 to 8 meters.[10]

Reproduction[edit]

Hypothesised ontogenic development of Pachyrhinosaurus perotorum

Possible neonate sized centrosaurine fossils have been documented in the scientific literature.[11] Research indicates that centrosaurines did not achieve fully developed mating signals until nearly fully grown.[12][3] Scott D. Sampson finds commonality between the slow growth of mating signals in centrosaurines and the extended adolescence of animals whose social structures are ranked hierarchies founded on age-related differences.[12] In these sorts of groups young males are typically sexually mature for several years before actually beginning to breed, when their mating signals are most fully developed.[13] Females, by contrast do not have such an extended adolescence.[13]

See also[edit]

Footnotes[edit]

  1. ^ a b Ryan, Michael J.; Holmes, Robert; Mallon, Jordan; Loewen, Mark; Evans, David C. (2016-10-27). "A basal ceratopsid (Centrosaurinae: Nasutoceratopsini) from the Oldman Formation (Campanian) of Alberta, Canada". Canadian Journal of Earth Sciences. 54 (1): 1–14. doi:10.1139/cjes-2016-0110. ISSN 0008-4077. 
  2. ^ a b c d Sampson, Scott D.; Lund, Eric K.; Loewen, Mark A.; Farke, Andrew A.; Clayton, Katherine E. (2013-09-07). "A remarkable short-snouted horned dinosaur from the Late Cretaceous (late Campanian) of southern Laramidia". Proc. R. Soc. B. 280 (1766): 20131186. doi:10.1098/rspb.2013.1186. ISSN 0962-8452. PMC 3730592Freely accessible. PMID 23864598. 
  3. ^ a b c Sampson, Scott D.; Ryan, Michael J.; Tanke, Darren H. (1997-11-01). "Craniofacial ontogeny in centrosaurine dinosaurs (Ornithischia: Ceratopsidae): taxonomic and behavioral implications". Zoological Journal of the Linnean Society. 121 (3): 293–337. doi:10.1111/j.1096-3642.1997.tb00340.x. ISSN 0024-4082. 
  4. ^ a b Ryan, Michael J. (2007-03-01). "A new basal centrosaurine ceratopsid from the oldman formation, southeastern alberta". Journal of Paleontology. 81 (2): 376–396. doi:10.1666/0022-3360(2007)81[376:ANBCCF]2.0.CO;2. ISSN 0022-3360. 
  5. ^ Maiorino, Leonardo; Farke, Andrew A; Kotsakis, Tassos; Piras, Paolo (2017). "Macroevolutionary patterns in cranial and lower jaw shape of ceratopsian dinosaurs (Dinosauria, Ornithischia): phylogeny, morphological integration, and evolutionary rates" (PDF). Evolutionary Ecology Research. 18: 123–167. 
  6. ^ Rivera-Sylva, H.E.; Frey, E.; Stinnesbeck, W.; Guzman-Gutirrez, J.R.; Gonzalez-Gonzalez (2017). "Mexican ceratopsids: Considerations on their diversity and evolution". Journal of South American Earth Sciences. doi:10.1016/j.jsames.2017.01.008. 
  7. ^ Kentaro Chiba; Michael J. Ryan; Federico Fanti; Mark A. Loewen; David C. Evans (2018). "New material and systematic re-evaluation of Medusaceratops lokii (Dinosauria, Ceratopsidae) from the Judith River Formation (Campanian, Montana)". Journal of Paleontology. in press. doi:10.1017/jpa.2017.62. 
  8. ^ a b c Xu, Xing; Wang, KeBai; Zhao, XiJin; Li, DunJing (2010-06-01). "First ceratopsid dinosaur from China and its biogeographical implications". Chinese Science Bulletin. 55 (16): 1631–1635. doi:10.1007/s11434-009-3614-5. ISSN 1001-6538. 
  9. ^ Lund, Eric K.; O’Connor, Patrick M.; Loewen, Mark A.; Jinnah, Zubair A. (2016-05-18). "A New Centrosaurine Ceratopsid, Machairoceratops cronusi gen et sp. nov., from the Upper Sand Member of the Wahweap Formation (Middle Campanian), Southern Utah". PLOS ONE. 11 (5): e0154403. doi:10.1371/journal.pone.0154403. ISSN 1932-6203. PMC 4871575Freely accessible. PMID 27192148. 
  10. ^ V., Rey, Luis (2007). Dinosaurs : the most complete, up-to-date encyclopedia for dinosaur lovers of all ages. Random House. ISBN 9780375824197. OCLC 930042495. 
  11. ^ "Abstract," Tanke and Brett-Surman (2001). Page 207.
  12. ^ a b "Retarded Growth of Mating Signals," Sampson (2001); page 270.
  13. ^ a b "Sociological Correlates in Extant Vertebrates," Sampson (2001); page 265.

References[edit]

  • Sampson, S. D. (1995b). "Two new horned dinosaurs from the Upper Cretaceous Two Medicine Formation of Montana; with a phylogenetic analysis of the Centrosaurinae (Ornithischia: Ceratopsidae)". Journal of Vertebrate Paleontology. 15 (4): 743–760. doi:10.1080/02724634.1995.10011259. 
  • Sampson, S. D., 2001, Speculations on the socioecology of Ceratopsid dinosaurs (Orinthischia: Neoceratopsia): In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, pp. 263–276.
  • Tanke, D.H. and Brett-Surman, M.K. 2001. Evidence of Hatchling and Nestling-Size Hadrosaurs (Reptilia:Ornithischia) from Dinosaur Provincial Park (Dinosaur Park Formation: Campanian), Alberta, Canada. pp. 206–218. In: Mesozoic Vertebrate Life—New Research Inspired by the Paleontology of Philip J. Currie. Edited by D.H. Tanke and K. Carpenter. Indiana University Press: Bloomington. xviii + 577 pp.