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Theriiformes Rowe, 1988

Trechnotheria
Trechnotheria
is a group of mammals that includes the therians and some fossil mammals from the Mesozoic
Mesozoic
Era. In the Jurassic
Jurassic
through Cretaceous
Cretaceous
periods, the group was endemic to what would be Asia
Asia
and Africa.[1] Trechnotheria
Trechnotheria
has been assigned various ranks, but was originally called a "superlegion" by the original author.[2] One reference has defined the Trechnotheria
Trechnotheria
as the clade comprising the last common ancestor of Zhangheotherium
Zhangheotherium
and living therian mammals, and all its descendants.[3]

Contents

1 Characteristics 2 Phylogeny 3 Sources 4 See also

Characteristics[edit] Like most Mesozoic
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] Phylogeny[edit] 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]

Trechnotheria

†Gobiconodonta

†Amphilestidae

†Amphidontidae

†Eutriconodonta

†Spalacotheriida

Cladotheria

†Dryolestida

Zatheria

†Vincelestidae

†Amphitheriida

†Peramuridae

Boreosphenida

†Aegialodontia

†Pappotheriidae

Theria

†Protodelphia

Metatheria→Marsupialia

Eutheria→Placentalia

Unassigned Trechnotheria:

†Austrotriconodon mckennai Bonaparte 1986 Austrotriconodontidae Bonaparte 1990 †Chaoyangodens lii Hou & Meng 2014

Paraphyletic
Paraphyletic
Symmetrodonta Simpson 1925

†Atlasodon monbaroni Sigogneau-Russell 1991 [Dryolestida, or Zatheria
Zatheria
indet., milk tooth (Averianov, 2002)] †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
Guimarota
freyi Kuhne 1968

Unassigned Zatheria:

†Arguimus khoshajari Dashzeveg 1979 [Arguitherium cromptoni Dashzeveg 1994] Arguimuridae Dashzeveg 1994 [Arguitheriidae Dashzeveg 1994] † Minimus richardfoxi Sigogneau-Russell 1999 †Magnimus ensomi Sigogneau-Russell 1999 †Mozomus shikamai Li et al. 2005 Mozomuridae 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

Sources[edit]

^ PaleoBiology Database: Trechnotheria, basic info " Trechnotheria
Trechnotheria
- Mammalia" Check url= value (help). Paleobiology Database. Retrieved 2009-10-21.  ^ 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) ^ 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) ^ Luo, Z.−X., Kielan−Jaworowska, Z., and Cifelli, R.L. (2002). "In quest for a phylogeny of Mesozoic
Mesozoic
mammals" (PDF). Acta Palaeontologica Polonica. 47 (1): 1–78. CS1 maint: Uses authors parameter (link) ^ Haaramo, Mikko. " Holotheria
Holotheria
– holotheres". Mikko's Phylogeny Archive. 

[1]

See also[edit]

Allotheria Cladotheria

Taxon identifiers

Wd: Q2141770 EoL: 42399412 Fossilworks: 64369

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