Gobiconodonta

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Gobiconodonts
Temporal range: Middle Jurassic–Early Cretaceous
Gobiconodon.jpg
Life restoration of a Gobiconodon
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Clade: Holotheria
Order: Gobiconodonta
Averianov & Lopatin, 2011
Families

The Gobiconodonta are a group of extinct mammals known from the Middle Jurassic (klameliids)[1] to Early Cretaceous.

Cladogram after Averianov & Lopatin, 2011:[2]


Gobiconodonta

Gobiconodontidae



Klameliidae




Amphilestidae

Amphilestes



Phascolotherium





Amphidontidae



Eutriconodonta

Bocaconodon




Jeholodentidae



Triconodontidae






Tinodon


Trechnotheria


Kiyatherium




Spalacotheriidae



Zhangheotheriidae





Cladotheria








Gobiconodonta was named by Averianov & Lopatin (2011); according to the authors it contained two families of mammals (gobiconodontids and klameliids)[2] that were traditionally assigned to Eutriconodonta.[1][3] The exact phylogenetic position of these families within Mammaliaformes is uncertain. Some analyses using only dental and mandibular characters (the first analysis of Gao et al., 2010,[4] Meng, Wang & Li, 2011,[5] Averianov & Lopatin, 2011[2]) found that gobiconodonts and eutriconodonts did not form a clade that wouldn't also include trechnotherians; however, some other analyses of dental and mandibular characters (Gaetano and Rougier, 2011,[6] 2012[7]) did recover gobiconodontids as eutriconodonts. The analysis conducted by Luo et al. (2007)[8] and the second analysis of Gao et al. (2010),[4] involving a broader range of Mesozoic mammaliaforms and more characters (including postcranial ones) recovered gobiconodontids as eutriconodonts as well. However, Gao et al. (2010) stressed that jeholodentids and gobiconodontids are the only eutriconodonts with known postcranial skeletons; according to the authors, it remains uncertain whether the results of their second analysis represent true phylogeny or are merely "a by-product of long branch attraction of jeholodentids and gobiconodontids".[4]

References[edit]

  1. ^ a b Thomas Martin and Alexander O. Averianov (2006). "A previously unrecognized group of Middle Jurassic triconodontan mammals from Central Asia". Naturwissenschaften 94 (1): 43–48. doi:10.1007/s00114-006-0155-5. PMID 17016686. 
  2. ^ a b c A. O. Averianov and A. V. Lopatin (2011). "Phylogeny of Triconodonts and Symmetrodonts and the Origin of Extant Mammals". Doklady Biological Sciences 436 (1): 32–35. doi:10.1134/s0012496611010042. 
  3. ^ Zofia Kielan-Jaworowska, Richard L. Cifelli, Zhe-Xi Luo (2004). "Chapter 7: Eutriconodontans". Mammals from the Age of Dinosaurs: origins, evolution, and structure. New York: Columbia University Press. pp. 216–248. ISBN 0-231-11918-6. 
  4. ^ a b c Chun-Ling Gao, Gregory P. Wilson, Zhe-Xi Luo, A. Murat Maga, Qingjin Meng and Xuri Wang (2010). "A new mammal skull from the Lower Cretaceous of China with implications for the evolution of obtuse-angled molars and ‘amphilestid’ eutriconodonts". Proceedings of the Royal Society B: Biological sciences 277 (1679): 237–246. doi:10.1098/rspb.2009.1014. PMC 2842676. PMID 19726475. 
  5. ^ Jin Meng, Yuanqing Wang and Chuankui Li (2011). "Transitional mammalian middle ear from a new Cretaceous Jehol eutriconodont". Nature 472 (7342): 181–185. doi:10.1038/nature09921. PMID 21490668. 
  6. ^ Leandro C. Gaetano and Guillermo W. Rougier (2011). "New materials of Argentoconodon fariasorum (Mammaliaformes, Triconodontidae) from the Jurassic of Argentina and its bearing on triconodont phylogeny". Journal of Vertebrate Paleontology 31 (4): 829–843. doi:10.1080/02724634.2011.589877. 
  7. ^ Leandro C. Gaetano and Guillermo W. Rougier (2012). "First Amphilestid from South America: A Molariform from the Jurassic Cañadón Asfalto Formation, Patagonia, Argentina". Journal of Mammalian Evolution 19 (4): 235–248. doi:10.1007/s10914-012-9194-1. 
  8. ^ Luo, Z.-X.; Chen, P.; Li, G. and Chen, M. (2007). "A new eutriconodont mammal and evolutionary development in early mammals.". Nature 446 (7133): 288–293. doi:10.1038/nature05627. PMID 17361176.