Elasmarians Temporal range: Cretaceous, | |
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Anabisetia | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Dinosauria |
Clade: | † Ornithischia |
Clade: | † Ornithopoda |
Clade: | † Elasmaria Calvo, Porfiri, and Novas, 2007 |
Genera | |
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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]
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]