Mochlodon

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Mochlodon
Temporal range: Late Cretaceous
Mochlodon vorosi.png
Cranial remains of Mochlodon vorosi
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Ornithischia
Suborder: Ornithopoda
Family: Rhabdodontidae
Genus: Mochlodon
Seeley, 1881
Type species
Iguanodon suessi
Bunzel, 1871
Species
  • M. suessi (Bunzel, 1871 [originally Iguanodon])
  • M. vorosi Ősi et al., 2012

Mochlodon is a genus of iguanodont dinosaurs from the Late Cretaceous.

History and Systematics[edit]

In 1859 coal mine administrator Pawlowitsch notified the University of Vienna that some fossils had been found in the Gute Hoffnung mine at Muthmannsdorf in Austria. A team headed by geologists Eduard Suess and Ferdinand Stoliczka subsequently uncovered numerous bones of several species, among them those of a euornithopod dinosaur. Stored at the university museum, the finds remained undescribed until they were studied by Emanuel Bunzel from 1870 onwards.[1] Bunzel in 1871 named the euornithopod a new species of Iguanodon: Iguanodon suessii.[2] The specific name honours Suess and is today more often spelled suessi. In 1881 Harry Govier Seeley named a separate genus: Mochlodon.[3] The generic name is derived from Greek mokhlos, "bar", and odon, "tooth", a reference to the bar-like median ridge on the teeth. The type species is Mochlodon suessi. Mochlodon and Struthiosaurus, the latter found at the same site, are the only dinosaur genera named from Austrian finds.

The type specimen PIUW 2349 was found in the Coal-Bearing Complex Formation of the Gosau Group dating from the Lower Campanian, about eighty million years old. It consists of a dentary, two vertebrae (presently lost), a parietal, a scapula, an ulna, a manual ungual, a femur and a tibia. Bunzel did not assign a holotype. In 2005 the dentary was chosen as the lectotype.

Vertebrae of Mochlodon vorosi

At the end of the nineteenth century Baron Franz Nopcsa noted the similarity of fossils found in Romania to both the French Rhabdodon and the Austrian Mochlodon. In 1899 he named some of these Mochlodon inkeyi, the specific name honouring Béla Inkey, but the same year changed the name into Rhabdodon inkeyi. In 1900 Nopcsa named some Romanian remains Mochlodon robustum[4] (emended to M. robustus in 1990 by George Olshevsky). In 1915 however, he concluded that all this material could be referred to Rhabdodon, the Austrian remains to Rhabdodon priscus. In later years, Mochlodon was often considered a nomen dubium. In 2003, when M. robustus was renamed Zalmoxes, Mochlodon was tentatively reinstated as a separate genus for the species Mochlodon suessi. In 2005 a study concluded that no unique derived features, autapomorphies, could be established for Mochlodon in relation to Zalmoxes, assigning the Austrian remains provisionally to a Zalmoxes sp.; a definite identification would give Mochlodon nomenclatural priority.[5]

A second species, M. vorosi, was described in 2012.[6]

Mochlodon was a small bipedal herbivore.

Mochlodon is since 2003 considered a member of the Rhabdodontidae.

Notes[edit]

  1. ^ Bunzel, E. (1870). "Notice of a Fragment of a Reptilian Skull from the Upper Cretaceous of Grunbach". Quarterly Journal of the Geological Society. 26: 394. doi:10.1144/GSL.JGS.1870.026.01-02.35. 
  2. ^ E. Bunzel, 1871, "Die Reptilfauna der Gosauformation in der Neuen Welt bei Wiener-Neustadt", Abhandlungen der Kaiserlich-Königlichen Geologischen Reichsanstalt 5: 1-18
  3. ^ Seeley, H. G. (1881). "The Reptile Fauna of the Gosau Formation preserved in the Geological Museum of the University of Vienna: with a Note on the Geological Horizon of the Fossils at Neue Welt, west of Wiener Neustadt, by Edw. Suess, Ph.D., F.M.G.S., &c., Professor of Geology in the University of Vienna, &c". Quarterly Journal of the Geological Society. 37: 620–707. doi:10.1144/GSL.JGS.1881.037.01-04.49. 
  4. ^ F. Nopcsa, 1900, "Dinosaurierreste aus Siebenbürgen (Schädel von Limnosaurus transsylvanicus nov. gen. et spec.)", Denkschriften der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe 68: 555-591
  5. ^ Sachs, S; Hornung, J (2006). "Juvenile ornithopod (Dinosauria: Rhabdodontidae) remains from the Upper Cretaceous (Lower Campanian, Gosau Group) of Muthmannsdorf (Lower Austria)". Geobios. 39 (3): 415–425. doi:10.1016/j.geobios.2005.01.003. 
  6. ^ 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 3448614Freely accessible. PMID 23028518. 

References[edit]