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Theriiformes Rowe, 1988

Trechnotheria is a group of mammals that includes the therians and some fossil mammals from the Mesozoic Era In the Jurassic through Cretaceous periods, the group was endemic to what would be Asia and Africa[1]

Trechnotheria has been assigned various ranks, but was originally called a "superlegion" by the original author[2] One reference has defined the Trechnotheria as the clade comprising the last common ancestor of Zhangheotherium and living therian mammals, and all its descendants[3]


  • 1 Characteristics
  • 2 Phylogeny
  • 3 Sources
  • 4 See also


Like most Mesozoic mammal groups, early trechnotherians are known mainly from their teeth Hence, one of the most prominent features of this group is the "hypertrophied postvallum/prevallid shearing mechanism", along with other dental characters Features of the shoulder blade, tibia, humerus, and ankle joint also diagnose this clade[4]


A cladogram compiled by Mikko Haaramo and based on individual cladograms of after After Luo, Cifelli & Kielan-Jaworowska, 2001, Luo, Kielan-Jaworowska & Cifelli, 2002 and, Kielan-Jaworowska, Cifelli & Luo, 2004[5]




















  • Unassigned Trechnotheria:
    • †Austrotriconodon mckennai Bonaparte 1986
    • †Chaoyangodens lii Hou & Meng 2014
  • Paraphyletic Symmetrodonta Simpson 1925
    • †Atlasodon monbaroni Sigogneau-Russell 1991
    • †Kennetheredium leesi Sigogneau-Russell 2003a
    • †Kotatherium haldanei Datta 1981
    • †Trishulotherium kotaensis Yadagiri 1985
  • Unassigned Cladotheria:
    • †Afriquiamus nesovi Sigogneau-Russell 1999
    • †Butlerigale Kühne 1968
    • †Chunnelodon alopekodes Ensom & Sigogneau-Russell 1998
    • †Guimarota freyi Kuhne 1968
  • Unassigned Zatheria:
    • †Arguimus khoshajari Dashzeveg 1979
    • †Minimus richardfoxi Sigogneau-Russell 1999
    • †Magnimus ensomi Sigogneau-Russell 1999
    • †Mozomus shikamai Li et al 2005
    • †Nanolestes Martin 2002
      • †N drescherae Martin 2002
      • †N krusati Martin 2002
      • †N mackennai Martin, Averianov & Pfretzschner 2010
  • Unassigned Boreosphenida:
    • †Argaliatherium robustum Cifelli & Davis 2015
    • †Carinalestes murensis Cifelli & Davis 2015
    • †Hypomylos Sigogneau-Russell 1992
      • †H phelizoni Sigogneau-Russell 1992
      • †H micros Sigogneau-Russell 1994
    • †Picopsidae Fox 1980
      • †Picopsis pattersoni Fox 1980
      • †Tirotherium aptum Montellano-Ballesteros & Fox 2015


  1. ^ PaleoBiology Database: Trechnotheria, basic info "Trechnotheria - Mammalia" Check |url= value help Paleobiology Database Retrieved 2009-10-21 
  2. ^ McKenna, Malcolm C, & Bell, Susan K 2000 Classification of Mammals above the Species Level University of Chicago Press p 43 CS1 maint: Uses authors parameter link
  3. ^ Kielan-Jaworowska, Zofia; Cifelli, Richard; & Luo Zhe-Xi Mammals from the age of dinosaurs: origins, evolution, and structure Columbia University Press p 366 ISBN 978-0-231-11918-4 CS1 maint: Uses authors parameter link
  4. ^ Luo, Z−X, Kielan−Jaworowska, Z, and Cifelli, RL 2002 "In quest for a phylogeny of Mesozoic mammals" PDF Acta Palaeontologica Polonica 47 1: 1–78 CS1 maint: Uses authors parameter link
  5. ^ Haaramo, Mikko "Holotheria – holotheres" Mikko's Phylogeny Archive 

See also

  • Allotheria
  • Cladotheria

Trechnotheria Information about


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    Trechnotheria beatiful post thanks!


Trechnotheria viewing the topic.
Trechnotheria what, Trechnotheria who, Trechnotheria explanation

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