A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil - PubMed (original) (raw)

A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil

Alexander W A Kellner et al. An Acad Bras Cienc. 2011 Mar.

Free article

Abstract

A new spinosaurid taxon, Oxalaia quilombensis gen. et sp. nov., is described based on the anterior part of a snout and a fragment of a maxilla. These specimens were collected at the Laje do Coringa site, Late Cretaceous (Cenomanian) of the São Luis Basin. Unlike Cristatusaurus and Suchomimus, Oxalaia quilombensis lacks serrations on the teeth. The new species differs from Angaturama limai by having the anterior part of the premaxillae more expanded and by lacking a sagittal premaxillary crest. It further differs from Spinosaurus cf. S. aegyptiacus and the Algerian spinosaurid by the rounder shape of the terminal expansion. Furthermore, xalaia quilobensis has one functional tooth followed by two replacement teeth, a feature not previously observed in theropods. Oxalaia quilombensis appears to be more closely related to the spinosaurids found in North Africa than to the Brazilian members of this clade and thus further increases the diversity of these enigmatic predatory dinosaurs in this country.

PubMed Disclaimer

Similar articles

• Spinosaur taxonomy and evolution of craniodental features: Evidence from Brazil.
  Sales MAF, Schultz CL. Sales MAF, et al. PLoS One. 2017 Nov 6;12(11):e0187070. doi: 10.1371/journal.pone.0187070. eCollection 2017. PLoS One. 2017. PMID: 29107966 Free PMC article.
• On the first Baryonychinae (Theropoda, Spinosauridae) teeth from South America.
  Lacerda MBS, Aragão PRL, Vieira FS, Sales MAF, Liparini A. Lacerda MBS, et al. Zootaxa. 2023 Apr 17;5264(4):526-544. doi: 10.11646/zootaxa.5264.4.4. Zootaxa. 2023. PMID: 37518033
• The first definitive Asian spinosaurid (Dinosauria: Theropoda) from the Early Cretaceous of Laos.
  Allain R, Xaisanavong T, Richir P, Khentavong B. Allain R, et al. Naturwissenschaften. 2012 May;99(5):369-77. doi: 10.1007/s00114-012-0911-7. Epub 2012 Apr 18. Naturwissenschaften. 2012. PMID: 22528021
• Morphofunctional Analysis of the Quadrate of Spinosauridae (Dinosauria: Theropoda) and the Presence of Spinosaurus and a Second Spinosaurine Taxon in the Cenomanian of North Africa.
  Hendrickx C, Mateus O, Buffetaut E. Hendrickx C, et al. PLoS One. 2016 Jan 6;11(1):e0144695. doi: 10.1371/journal.pone.0144695. eCollection 2016. PLoS One. 2016. PMID: 26734729 Free PMC article.
• Unenlagiinae revisited: dromaeosaurid theropods from South America.
  Gianechini FA, Apesteguia S. Gianechini FA, et al. An Acad Bras Cienc. 2011 Mar;83(1):163-95. doi: 10.1590/s0001-37652011000100009. An Acad Bras Cienc. 2011. PMID: 21437380 Review.

Cited by

• Modified skulls but conservative brains? The palaeoneurology and endocranial anatomy of baryonychine dinosaurs (Theropoda: Spinosauridae).
  Barker CT, Naish D, Trend J, Michels LV, Witmer L, Ridgley R, Rankin K, Clarkin CE, Schneider P, Gostling NJ. Barker CT, et al. J Anat. 2023 Jun;242(6):1124-1145. doi: 10.1111/joa.13837. Epub 2023 Feb 13. J Anat. 2023. PMID: 36781174 Free PMC article.
• A new theropod dinosaur from the early cretaceous (Barremian) of Cabo Espichel, Portugal: Implications for spinosaurid evolution.
  Mateus O, Estraviz-López D. Mateus O, et al. PLoS One. 2022 Feb 16;17(2):e0262614. doi: 10.1371/journal.pone.0262614. eCollection 2022. PLoS One. 2022. PMID: 35171930 Free PMC article.
• Spinosaur taxonomy and evolution of craniodental features: Evidence from Brazil.
  Sales MAF, Schultz CL. Sales MAF, et al. PLoS One. 2017 Nov 6;12(11):e0187070. doi: 10.1371/journal.pone.0187070. eCollection 2017. PLoS One. 2017. PMID: 29107966 Free PMC article.
• The "χ" of the Matter: Testing the Relationship between Paleoenvironments and Three Theropod Clades.
  Sales MA, Lacerda MB, Horn BL, de Oliveira IA, Schultz CL. Sales MA, et al. PLoS One. 2016 Feb 1;11(2):e0147031. doi: 10.1371/journal.pone.0147031. eCollection 2016. PLoS One. 2016. PMID: 26829315 Free PMC article.
• A reappraisal of the morphology and systematic position of the theropod dinosaur Sigilmassasaurus from the "middle" Cretaceous of Morocco.
  Evers SW, Rauhut OW, Milner AC, McFeeters B, Allain R. Evers SW, et al. PeerJ. 2015 Oct 20;3:e1323. doi: 10.7717/peerj.1323. eCollection 2015. PeerJ. 2015. PMID: 26500829 Free PMC article.

Publication types

MeSH terms

LinkOut - more resources

• Full Text Sources

  • Scientific Electronic Library Online