| Triisodontidae
Paleocene[1] | |
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| Triisodon quivirensis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Mesonychia |
| Family: | †Triisodontidae Trouessart, 1904 |
| Type genus | |
| †Triisodon
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| Genera | |
Triisodontidae is an extinct, probably paraphyletic, or possibly invalid familyofmesonychian placental mammals. Most triisodontid genera lived during the PaleoceneinNorth America, but the genus Andrewsarchus (if it is a mesonychian, and not an artiodactyl) is known from the middle EoceneofAsia.[2] Triisodontids were the first relatively large predatory mammals to appear in North America following the extinction of the non-bird dinosaurs.[3] They differ from other mesonychian families in having less highly modified teeth.[4]
Because of their comparatively simpler teeth, the triisodontids are regarded as basal mesonychids. A recent study found them to be a paraphyletic assemblage of stem-mesonychians.[5]
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| Triisodontidae |
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| Mesonychidae |
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| Hapalodectidae |
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| Triisodontidae |
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