That is all the ornithopods except for the small, fast-running Hypsilophodon. This is placed in the family Hypsilophodontidae. However, the important reference work Vertebrate Paleontology is not yet in support of this trend, and lists the families separately as Ornithopods. The proposal is therefore still under discussion.
- Sereno P.C. 2005. Stem Archosauria Version 1.0. TaxonSearch. http://www.taxonsearch.org/Archive/stem-archosauria-1.0.php Accessed 24 November 2010
- McDonald A.T. et al. 2010. New basal Iguanodonts from the Cedar Mountain Formation of Utah and the evolution of thumb-spiked Dinosaurs. PLoS ONE 5, 11: e14075. doi:10.1371/journal.pone.0014075 PMID 21124919
- Carpenter K. and Ishida Y. (2010). "Early and "Middle" Cretaceous Iguanodonts in time and space". Journal of Iberian Geology 36 (2): 145–164. doi:10.5209/rev_JIGE.2010.v36.n2.3. http://www.ucm.es/info/estratig/JIG/vol_content/vol_36_2/36_2_145_164_Carpenter.pdf.
- Benton M.J. 2005. Vertebrate paleontology. 3rd ed, Blackwell Science, Oxford.