| LittleLazyLass/Rhabdodontomorpha Temporal range: Cretaceous,
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| Muttaburrasaurus mount at the Queensland Museum | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Ornithopoda |
| Clade: | †Iguanodontia |
| Clade: | †Rhabdodontomorpha Dieudonné et al., 2016 |
| Subgroups | |
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Rhabdodontomorpha is a clade of basal iguanodont dinosaurs. This group was named in 2016 in the context of the description, based on Spanish findings, of an early member of the Rhabdodontidae.
The group consists of small to large plant eaters from Europe and Gondwana. It must have split from other iguanodont groups during the Middle Jurassic.[1]
Rhabdodontids were herbivorous ornithopod dinosaurs from the Cretaceous Period. Rhabdodontids were similar to large, robust iguanodonts, with deep skulls and jaws. The family was first proposed by David B. Weishampel and colleagues in 2003.[2] Rhabdodontid fossils have been found in Europe in formations dating to the Late Cretaceous.
History of study edit
Early discoveries edit
Modern conception edit
Inclusion of Muttaburrasaurus edit
Anatomy edit
Sexual dimorphism edit
Classification edit
There are differing opinions as to the constituents of Rhabdodontidae. Originally they were defined as the last common ancestor of Zalmoxes robustus and Rhabdodon priscus.[citation needed] Later, Paul Sereno proposed a new definition, the most inclusive clade containing Rhabdodon priscus but not Parasaurolophus walkeri.[3] More recently, a morphological diagnosis was proposed, that excluded Muttaburrasaurus, unlike Sereno's definition. The clade Rhabdodontomorpha was coined to contain the larger group.[1] The following cladogram was recovered by Dieudonné et al. (2016).[1]
A cladistic analysis was conducted in which it was found that Muttaburrasaurus was the sister species of the Rhabdodontidae sensu Weishampel. Therefore, Paul-Emile Dieudonné, Thierry Tortosa, Fidel Torcida Fernández-Baldor, José Ignacio Canudo and Ignacio Díaz-Martínez defined Rhabdodontomorpha as a nodal clade: the group consisting of the last common ancestor of Rhabdodon priscus Matheron, 1869 and Muttaburrasaurus langdoni Bartholomai and Molnar, 1981; and all its descendants. Within the clade are included also Zalmoxes and Mochlodon.[1]
Evolution edit
Traditionally, it has been thought Mochlodon and Zalmoxes were insular dwarfs. However, Ősi et al. (2012) proposed that Rhabdodon underwent gigantism on the mainland, as opposed to Zalmoxes and Mochlodon experiencing nanism on island habitats.[4]
Palaeobiology edit
Chewing and feeding edit
Locomotion edit
Palaeoecology edit
Distribution edit
Predation edit
Niche partitioning with hadrosaurs edit
References edit
- ^ a b c d Dieudonné; et al. (2016). "An Unexpected Early Rhabdodontid from Europe (Lower Cretaceous of Salas de los Infantes, Burgos Province, Spain) and a Re-Examination of Basal Iguanodontian Relationships". PLoS ONE. 11 (6). doi:10.1371/journal.pone.0156251.
{{cite journal}}: Explicit use of et al. in:|author=(help)CS1 maint: unflagged free DOI (link) - ^ Weishampel, D.B.; Jianu, C.-M.; Csiki, Z.; Norman, D.B. (2003). "Osteology and phylogeny of Zalmoxes (n. g.), an unusual euornithopod dinosaur from the Latest Cretaceous of Romania". Journal of Systematic Palaeontology. 1 (2): 65_123. doi:10.1017/S1477201903001032.
- ^ Sereno, P.C. (2005). "Stem Archosauria Version 1.0." TaxonSearch. Available: http://www.taxonsearch.org/Archive/stem-archosauria-1.0.php Archived 2009-01-15 at the Wayback Machine via the Internet. Accessed 24 November 2010.
- ^ Ősi, A.; Prondvai, E.; Butler, R.; Weishampel, D. B. (2012). Evans, Alistair Robert (ed.). "Phylogeny, Histology and Inferred Body Size Evolution in a New Rhabdodontid Dinosaur from the Late Cretaceous of Hungary". PLoS ONE. 7 (9): e44318. doi:10.1371/journal.pone.0044318. PMC 3448614. PMID 23028518.
{{cite journal}}: CS1 maint: unflagged free DOI (link)
External links edit
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