Rhabdodontidae

Rhabdodontidae
Temporal range: Late Cretaceous, 83–66 Ma
Rhabdodon priscus
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Clade:Dinosauria
Order:†Ornithischia
Suborder:†Ornithopoda
Clade:†Rhabdodontomorpha
Family:†Rhabdodontidae
Weishampel, 2003
Genera

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.[1] Rhabdodontid fossils have been found in Europe in formations dating to the Late Cretaceous.

Classification

Comparison of rhabdodontid dentaries

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. Later, Paul Sereno proposed a new definition, the most inclusive clade containing Rhabdodon priscus but not Parasaurolophus walkeri.[2] More recently, a morphological diagnosis was proposed, that excluded Muttaburrasaurus, unlike Sereno's definition. The clade Rhabdodontomorpha was coined to contain the larger group.[3] The following cladogram was recovered by Dieudonné et al. (2016).[3]

Iguanodontia

 

 

Anabisetia

 
 

 

Tenontosaurus

 
 

Dryomorpha

 
 
 
Rhabdodontomorpha

 

Muttaburrasaurus

 
 

 

Vegagete Ornithopod

 
Rhabdodontidae

 

Mochlodon

 
 

 

Rhabdodon

 
 

Zalmoxes

 
 
 
 
 
 

Evolution

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]

References

  1. ↑ 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.
  2. ↑ 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.
  3. 1 2 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.
  4. ↑ 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.
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