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. 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. In 2019, Matthew C. Herne and colleagues redefined Elasmaria as "all taxa closer to ''Macrogryphosaurus gondwanicus'' and ''Talenkauen santacrucensis'' than to '' Hypsilophodon foxii'' or '' Iguanodon bernissartensis''", expanding the definition to include the large number of taxa now found to be part of the clade. The cladogram below results from analysis by Herne ''et al.'', 2019.References
{{Taxonbar, from=Q4444891 Early Cretaceous first appearances Maastrichtian extinctions Ornithopods