Symmetrodontov [1] ( Latin Symmetrodonta ) - a group of Mesozoic mammals, previously considered in the rank of the detachment. The hallmark of the group is a special triangular molars . Lived from the end of the Triassic to the end of the Cretaceous. Most researchers in the XXI century came to the conclusion that they do not constitute a separate monophyletic group. However, the name "Symmetrodonta" is still informally used by some researchers for convenience [2] . Other researchers retained the taxon in the rank of the infraclass, reducing its volume to 4 extinct genera [3] .
| Symmetrodonts |
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 Fossils of Zhangheotherium quinquecuspidens |
| Scientific classification |
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| Kingdom: | Animals | | Class: | Mammals | | Subclass: | Terioobraznye | | Infraclass: | Golotorii | | Nadlegion: | Trehnoterii | | Legion: | † Symmetrodonts |
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| Latin name |
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| Symmetrodonta Simpson, 1925 |
| Mamaliaformes |
| Sinoconodon |
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| Adelobasileus |
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| Morganucodon |
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| Megazostrodon |
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| Hadrocodium |
| | Mamalmalia |
| Australosphenida |
| | Boreosphenida |
| Fruitafossor |
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| Eutriconodonta |
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| | Allotheria |
| Tinodon |
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| Haramiyavia |
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| Arboroharamiya |
| | Multituberculata | |
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