Back وحشيات متشعبة Arabic Trechnotheria Azerbaijani Trecnoteris Catalan Trechnotheria Spanish Trechnotheria Basque شاخهددان Persian Trechnotheria French Trechnotheria ID Trechnotheria Italian Trechnotheria Dutch
| Trechnotherians Temporal range:
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|---|---|
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| Fossil of Zhangheotherium, a symmetrodont | |
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| Red fox, a modern-day trechnotherian | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Clade: | Theriiformes |
| Clade: | Trechnotheria McKenna, 1975 |
| Subgroups[1] | |
Trechnotheria is a group of mammals that includes the therians and some fossil mammals from the Mesozoic Era. It includes both the extinct symmetrodonts and the living Cladotheria.
Trechnotheria has been assigned various ranks, but was originally described as a "superlegion" by the naming authority.[2] A later node-based definition for Trechnotheria was the clade comprising the last common ancestor of Zhangheotherium and living therian mammals, and all its descendants.[3] Alternatively it can be defined as the group with true symmetrodontia, being defined as an apomorphy rather than being defined as a node, the redefinition includes the Tinodontids.[4]
- ^ Cite error: The named reference
Luo et al. 2002was invoked but never defined (see the help page). - ^ McKenna, Malcolm C.; Bell, Susan K. (1997). Classification of Mammals: Above the Species Level. Columbia University Press. p. 43. ISBN 978-0-231-52853-5.
- ^ Kielan-Jaworowska, Zofia; Cifelli, Richard; Luo Zhe-Xi (5 February 2005). Mammals from the age of dinosaurs: origins, evolution, and structure. Columbia University Press. p. 366. ISBN 978-0-231-11918-4.
- ^ Lasseron, Maxime; Martin, Thomas; Allain, Ronan; Haddoumi, Hamid; Jalil, Nour-Eddine; Zouhri, Samir; Gheerbrant, Emmanuel (2022-06-02). "An African Radiation of 'Dryolestoidea' (Donodontidae, Cladotheria) and its Significance for Mammalian Evolution". Journal of Mammalian Evolution. 29 (4): 733–761. doi:10.1007/s10914-022-09613-9. ISSN 1064-7554. S2CID 249324444.
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