Allotheria

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Allotheria
Temporal range: Late Triassic-Miocene, 153–17.5 Ma
Ptilodus skull BW.jpg
Skull of Ptilodus
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Subclass: Theriiformes
Infraclass: Allotheria
Marsh, 1880
Subgroups

Allotheria (meaning "other beasts", from the Greek αλλός, allos-other and θήριον, therion-wild animal) is an extinct branch of successful Mesozoic mammals. The most important characteristic was the presence of lower molariform teeth equipped with two longitudinal rows of cusps.[1] Allotheria includes Multituberculata, Gondwanatheria (which may be part of Multituberculata, the sister group to Cimolodonta),[2][3][4][5] and probably Haramiyida,[6] though some studies show them to not even be mammals and differing from true allotheres significantly.[7][8]

Allotheres also had a narrow pelvis, indicating that they gave birth to tiny helpless young like marsupials do.

Interpretations[edit]

When he first identified Allotheria in 1880, Othniel Marsh regarded this group as an order within Marsupialia. But in 1997, McKenna and Bell classified Allotheria as an infraclass.

References[edit]

  1. ^ Butler, P.M. (2000). "Review of the early allotherian mammals". Acta Palaeontologica Polonica 45 (4): 317–342. 
  2. ^ Krause, D. W.; Prasad, G. V. R.; von Koenigswald, W.; Sahni, A.; Grine, F. E. (1997). "Cosmopolitanism among Gondwanan Late Cretaceous mammals" (PDF). Nature 390 (6659): 504–507. Bibcode:1997Natur.390..504K. doi:10.1038/37343. 
  3. ^ Krause, David W.; Hoffmann, Simone; Wible, John R.; Kirk, E. Christopher; Schultz, Julia A.; von Koenigswald, Wighart; Groenke, Joseph R.; Rossie, James B. (2014-11-05). O'Connor, Patrick M., Seiffert, Erik R., Dumont, Elizabeth R., Holloway, Waymon L., Rogers, Raymond R., Rahantarisoa, Lydia J., Kemp, Addison D., Andriamialison, Haingoson. "First cranial remains of a gondwanatherian mammal reveal remarkable mosaicism". Nature (Nature Publishing Group, a division of Macmillan Publishers Limited). online. Bibcode:2014Natur.515..512K. doi:10.1038/nature13922. ISSN 1476-4687. 
  4. ^ Drake, Nadia (November 5, 2014). "Fossil From Dinosaur Era Reveals Big Mammal With Super Senses". nationalgeographic.com. National Geographic Society. Retrieved November 5, 2014. 
  5. ^ Wilford, John Noble (November 5, 2014). "Fossil’s Unusual Size and Location Offer Clues in Evolution of Mammals". New York Times. Retrieved November 6, 2014. 
  6. ^ Luo, Z.-X.; Kielan-Jaworowska, Z.; Cifelli, R.L. (2002). "In quest for a phylogeny of Mesozoic mammals". Acta Palaeontologica Polonica 47 (1): 1–78. 
  7. ^ Chang, Kenneth (16 November 2015). "Jawbone in Rock May Clear Up a Mammal Family Mystery". New York Times. Retrieved 17 November 2015. 
  8. ^ Luo, Zhe-Xi; Gates, Stephen M.; Jenkins Jr., Farish A.; Amaral, William W.; Shubin, Neil H. (16 November 2015). "Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution". PNAS. doi:10.1073/pnas.1519387112. Retrieved 17 November 2015. 

Further reading[edit]

Zofia Kielan-Jaworowska, Richard L. Cifelli, and Zhe-Xi Luo, Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure (New York: Columbia University Press, 2004), 249.