Elasmaria

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Elasmarians
Temporal range: Cretaceous, 127–66  Ma
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Anabisetia
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Ornithischia
Clade: Ornithopoda
Clade: Elasmaria
Calvo, Porfiri, and Novas, 2007
Genera

Elasmaria is a clade of ornithopods known from Cretaceous deposits in South America, Antarctica, and Australia that contains many bipedal ornithopods that were previously considered "hypsilophodonts". [1] [2]

Classification

Calvo et al. (2007) coined Elasmaria to accommodate Macrogryphosaurus and Talenkauen , which they recovered as basal iguanodonts distinct from other iguanodontians in having mineralized plates on the ribs. [3] In 2016, a paper describing the genus Morrosaurus found Elasmaria to be far larger than its initial contents of two taxa, instead containing a variety of ornithopods from the Southern Hemisphere. [4] In 2021, under the Phylocode, Madzia et al. (2021) formally defined Elasmaria as "the smallest clade containing Macrogryphosaurus gondwanicus and Talenkauen santacrucensis, provided that it does not include Hypsilophodon foxii , Iguanodon bernissartensis , or Thescelosaurus neglectus . [5] Fonseca et al. (2024) redefined Elasmaria as "the largest clade containing Macrogryphosaurus gondwanicus and Talenkauen santacrucensis but not Dryosaurus altus , Hypsilophodon foxii, Iguanodon bernissartensis, and Thescelosaurus neglectus" so that it included more related taxa. The cladogram below follows their preferred reference phylogeny, taken from the results of their own study. [6]

Ornithopoda
Hypsilophodontidae
Iguanodontia

Rhabdodontomorpha

Euiguanodontia

Callovosaurus leedsi

Dryomorpha
Elasmaria

References

  1. Boyd CA. (2015) The systematic relationships and biogeographic history of ornithischian dinosaurs. PeerJ 3:e1523 https://doi.org/10.7717/peerj.1523
  2. Madzia, Daniel; Boyd, Clint A.; Mazuch, Martin (2017). "A basal ornithopod dinosaur from the Cenomanian of the Czech Republic". Journal of Systematic Palaeontology: 1–13. doi:10.1080/14772019.2017.1371258.
  3. Calvo, Jorge O.; Porfiri, Juan D.; Novas, Fernando E. (2007). "Discovery of a new ornithopod dinosaur from the Portezuelo formation (Upper Cretaceous), Neuquen, Patagonia, Argentina". Arquivos do Museu Nacional, Rio de Janeiro. 65 (4): 471–483.
  4. Rozadilla, Sebastián; Agnolin, Federico L.; Novas, Novas; Rolando, Alexis M.Aranciaga; Motta, Matías J.; Lirio, Juan M.; Isasi, Marcelo P. (2016). "A new ornithopod (Dinosauria, Ornithischia) from the Upper Cretaceous of Antarctica and its palaeobiogeographical implications". Cretaceous Research. 57: 311–324. Bibcode:2016CrRes..57..311R. doi:10.1016/j.cretres.2015.09.009. hdl: 11336/46572 .
  5. Madzia, Daniel; Arbour, Victoria M.; Boyd, Clint A.; Farke, Andrew A.; Cruzado-Caballero, Penélope; Evans, David C. (2021-12-09). "The phylogenetic nomenclature of ornithischian dinosaurs". PeerJ. 9: e12362. doi: 10.7717/peerj.12362 . ISSN   2167-8359. PMC   8667728 . PMID   34966571.
  6. Fonseca, André O.; Reid, Iain J.; Venner, Alexander; Duncan, Ruairidh J.; Garcia, Mauricio S.; Müller, Rodrigo T. (2024-06-21). "A comprehensive phylogenetic analysis on early ornithischian evolution". Journal of Systematic Palaeontology. 22 (1). Bibcode:2024JSPal..2246577F. doi:10.1080/14772019.2024.2346577. ISSN   1477-2019.