Diplocynodon

<i>Diplocynodon</i>

Diplocynodon

Extinct genus of reptiles


Quick Facts Scientific classification, Species ...

Diplocynodon is an extinct genus of alligatoroid crocodilian that lived during the Paleocene to Middle Miocene in Europe. Some species may have reached lengths of 3 metres (9.8 ft),[7] while others probably did not exceed 1 metre (3.3 ft).[8] They are almost exclusively found in freshwater environments.[9] The various species are thought to have been opportunistic aquatic predators.[10]

In the nineteenth century, D. steineri was named from Styria, Austria and D. styriacus was named from Austria and France. A third Austrian species, Enneodon ungeri, was placed in its own genus. The Austrian and French species of Diplocynodon were synonymized with E. ungeri in 2011, and because the name Diplocynodon has priority over Enneodon, the species is now called D. ungeri.[11] Other genera have recently been found to be synonymous with Diplocynodon. Hispanochampsa muelleri of Spain was determined to be synonymous with Diplocynodon in 2006,[5] and Baryphracta deponaie of Germany was confirmed to be synonymous with Diplocynodon in 2012.[3]

Well preserved specimens have been found in the Messel Pit and the Geiseltal lignite deposit in Germany. Most articulated Diplocynodon specimens from these localities contain gastroliths. In the Eocene epoch, the German sites were either a swampy freshwater lake (Messel Pit) or a peat bog swamp (Geiseltal).

Species

More information Species, Age ...

*Locality and/or horizon of the type specimen.

Phylogeny

Diplocynodon is one of the basal-most members of the superfamily Alligatoroidea. Diplocynodon's placement within Alligatoroidea can be shown in the cladogram below, based on a 2018 tip dating study by Lee & Yates that simultaneously used morphological, molecular (DNA sequencing), and stratigraphic (fossil age) data.[13]

Crocodylia

Below is a more detailed cladogram of Diplocynodon:[14]

Diplocynodon

Diplocynodon deponiae

Diplocynodon darwini

Diplocynodon hantoniensis

Diplocynodon ratelii

Diplocynodon tormis

Diplocynodon muelleri


References

  1. Rio, Jonathan P.; Mannion, Philip D. (6 September 2021). "Phylogenetic analysis of a new morphological dataset elucidates the evolutionary history of Crocodylia and resolves the long-standing gharial problem". PeerJ. 9: e12094. doi:10.7717/peerj.12094. PMC 8428266. PMID 34567843.
  2. Rossmann, T.; Blume, M. (1999). "Die Krokodil-Fauna der Fossillagerstätte Grube Messel". Ein aktueller Überblick., Natur und Museum, Frankfurt am Main. 129 (9): 261–270.
  3. Massimo Delfino; Thierry Smith (2012). "Reappraisal of the morphology and phylogenetic relationships of the middle Eocene alligatoroid Diplocynodon deponiae (Frey, Laemmert, and Riess, 1987) based on a three-dimensional specimen". Journal of Vertebrate Paleontology. 32 (6): 1358–1369. Bibcode:2012JVPal..32.1358D. doi:10.1080/02724634.2012.699484. S2CID 84977303.
  4. Venczel M, Codrea VA (2022). "A new late Eocene alligatoroid crocodyliform from Transylvania". Comptes Rendus Palevol. 21 (20): 411–429. doi:10.5852/cr-palevol2022v21a20. S2CID 248879850.
  5. Kälin, J. A. (1936). "Hispanochampsa mülleri nov. gen. nov. sp". Abh. Schweizer. Palaeontol. Gesellschaft. 58: 1–39.
  6. Sabău I, Venczel M, Codrea VA, Bordeianu M. 2021. Diplocynodon: a salt water eocene crocodile from Transylvania? North-Western Journal of Zoology 17(1):117-121
  7. Jeremy E. Martin; Martin Gross (2011). "Taxonomic clarification of Diplocynodon Pomel, 1847 (Crocodilia) from the Miocene of Styria, Austria". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 261 (2): 177–193. doi:10.1127/0077-7749/2011/0159.
  8. Jeremy E. Martin (2010). "A new species of Diplocynodon (Crocodylia, Alligatoroidea) from the Late Eocene of the Massif Central, France, and the evolution of the genus in the climatic context of the Late Palaeogene". Geological Magazine. 147 (4): 596–610. Bibcode:2010GeoM..147..596M. doi:10.1017/S0016756809990161. S2CID 140593139.
  • Fossils (Smithsonian Handbooks) by David Ward (Page 243)



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