Jugulator amplissimus: Difference between revisions
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==Description== |
==Description== |
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''Jugulator'' is known primarily from isolated teeth and dentaries. The species is most distinctive in regards to its large size, being among the largest mammals in the region, some lower molars excedding 5 mm in length and with an estimated body weight of about 750 g. The medial lower incisor is greatly enlarged, with a mitten-shaped |
''Jugulator'' is known primarily from isolated teeth and dentaries. The species is most distinctive in regards to its large size, being among the largest mammals in the region, some lower molars excedding 5 mm in length and with an estimated body weight of about 750 g. The medial lower incisor is greatly enlarged, with a mitten-shaped crown that bears sharp cutting surfaces.<ref>Richard L. Cifelli & Scott K. Madsen, Triconodont mammals from the medial Cretaceous of Utah, Journal of Vertebrate Paleontology Volume 18, Issue 2, 1998, DOI:10.1080/02724634.1998.10011068</ref><ref>[[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.</ref> |
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==Phylogeny== |
==Phylogeny== |
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Revision as of 18:32, 29 October 2015
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| Genus: | †Jugulator Cifelli and Madsen 1998
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| Jugulator amplissimus Cifelli and Madsen 1998
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Jugulator is a genus of extinct mammal from the Cretaceous of North America. An eutriconodont, it is known from the Cedar Mountain Formation, and is both a large sized and possibly ecologically specialised taxon, showcasing the diversity of mammals in the Mesozoic.[1]
Description
Jugulator is known primarily from isolated teeth and dentaries. The species is most distinctive in regards to its large size, being among the largest mammals in the region, some lower molars excedding 5 mm in length and with an estimated body weight of about 750 g. The medial lower incisor is greatly enlarged, with a mitten-shaped crown that bears sharp cutting surfaces.[2][3]
Phylogeny
Always recognised as an alticonodontine eutriconodont,[4] the most recent phylogenetic studies recover Jugulator as part of a clade also including Volaticotherium, Ichthyoconodon and Argentoconodon.[5]
Biology
Jugulator is noted as being a rather large mammal for Mesozoic standards.[6] Combined with the general adaptations for carnivory that eutriconodonts display, it is safe to say that it was a predator of other vertebrates like mammals, lizards and small dinosaurs. Other large eutriconodonts like Repenomamus and Gobiconodon show evidence of scavenging and direct predation on such creatures, so it is likely that Jugulator also displayed these behaviours.[7]
Jugulator's closest relatives are known to be gliders or flyers,[8] so it can be assumed via phylogenetic bracketing that it was probably also volant.
Ecology
Jugulator occurs in the mid-Cretaceous eposits of the Cedar Mountain Formation, where several of North America's more iconic dinosaurs like Utahraptor and Cedarosaurus occur. A large variety of mammal species are known from here as well, including other eutriconodonts like Astroconodon and Corviconodon as well as multituberculates like Cedaromys and Janumys and several therian mammals such as the eutherian Montanalestes and the deltatheroidan metatherian Atokatheridium. These diverse mammal faunas offer a transition from dominant taxa in the Early Cretaceous and the multituberculate and therian dominated laurasian mammalian faunas of the Late Cretaceous.
References
- ^ Richard L. Cifelli & Scott K. Madsen, Triconodont mammals from the medial Cretaceous of Utah, Journal of Vertebrate Paleontology Volume 18, Issue 2, 1998, DOI:10.1080/02724634.1998.10011068
- ^ Richard L. Cifelli & Scott K. Madsen, Triconodont mammals from the medial Cretaceous of Utah, Journal of Vertebrate Paleontology Volume 18, Issue 2, 1998, DOI:10.1080/02724634.1998.10011068
- ^ 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.
- ^ Richard L. Cifelli & Scott K. Madsen, Triconodont mammals from the medial Cretaceous of Utah, Journal of Vertebrate Paleontology Volume 18, Issue 2, 1998, DOI:10.1080/02724634.1998.10011068
- ^ Gaetano, L.C.; Rougier, G.W. (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.
- ^ Richard L. Cifelli & Scott K. Madsen, Triconodont mammals from the medial Cretaceous of Utah, Journal of Vertebrate Paleontology Volume 18, Issue 2, 1998, DOI:10.1080/02724634.1998.10011068
- ^ 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.
- ^ Gaetano, L.C.; Rougier, G.W. (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.