« Symmetrodonta » : différence entre les versions
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catégorisation |
+auteur (Simpson) |
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{{Taxobox | classe | Mammalia }} |
{{Taxobox | classe | Mammalia }} |
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{{Taxobox | clade | Theriiformes }} |
{{Taxobox | clade | Theriiformes }} |
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{{Taxobox taxon | animal | ordre | Symmetrodonta | Simpson, 1925 }} |
{{Taxobox taxon | animal | ordre | Symmetrodonta | [[George Gaylord Simpson|Simpson]], [[1925]] }} |
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{{Taxobox fin}} |
{{Taxobox fin}} |
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Les '''Symmetrodonta''' sont un |
Les '''Symmetrodonta''' sont un [[Ordre (biologie)|ordre]] de [[mammifères]] du [[Mésozoïque]]. |
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'''Symmetrodonta''' is a basal group of [[Mesozoic]] [[mammals]] characterized by the triangular aspect of the [[Molar (tooth)|molar]]s when viewed from above and the absence of a well-developed [[talonid]]. The traditional group of symmetrodonts ranges in age from the latest [[Triassic]] to the Late [[Cretaceous]]. One species, ''Spalacotheridium noblei'', is notable for its small size. It is one of the smallest known mammals. Each individual molar is little more than 1/100th of an inch across. Symmetrodonta are generally rare and poorly represented in the fossil record. It remains entirely possible they do not represent a discrete phylogenetic category, but with a series of intermediates between [[triconodont]]s, on the one hand, and [[Dryolestoidea|dryolestoid]]s and [[theria]]ns, on the other. At least some genera of symmetrodonts may even be true therians and part of the (disputed) clade [[Trituberculata]]. |
'''Symmetrodonta''' is a basal group of [[Mesozoic]] [[mammals]] characterized by the triangular aspect of the [[Molar (tooth)|molar]]s when viewed from above and the absence of a well-developed [[talonid]]. The traditional group of symmetrodonts ranges in age from the latest [[Triassic]] to the Late [[Cretaceous]]. One species, ''Spalacotheridium noblei'', is notable for its small size. It is one of the smallest known mammals. Each individual molar is little more than 1/100th of an inch across. Symmetrodonta are generally rare and poorly represented in the fossil record. It remains entirely possible they do not represent a discrete phylogenetic category, but with a series of intermediates between [[triconodont]]s, on the one hand, and [[Dryolestoidea|dryolestoid]]s and [[theria]]ns, on the other. At least some genera of symmetrodonts may even be true therians and part of the (disputed) clade [[Trituberculata]]. |
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Particular sub−groups of Symmetrodonta are better studied, e.g. [[Spalacotheriidae]], which has acute−angled molariform teeth, strongly reduced [[talonid]]s, and conspicuous anterior and posterior [[cingulid]]s. |
Particular sub−groups of Symmetrodonta are better studied, e.g. [[Spalacotheriidae]], which has acute−angled molariform teeth, strongly reduced [[talonid]]s, and conspicuous anterior and posterior [[cingulid]]s. --> |
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== Liste de familles et genres == |
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==Classification== |
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* Ordre des '''SYMMETRODONTA''' |
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** Famille [[Kuehneotheriidae]] |
** Famille [[Kuehneotheriidae]] |
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*** Genre ''[[Kuehneotherium]]'' |
*** Genre ''[[Kuehneotherium]]'' |
Version du 6 novembre 2020 à 09:08
Symmetrodonta
Reconstitution du squelette de Zhangheotherium quinquecuspidens.
Règne | Animalia |
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Embranchement | Chordata |
Sous-embr. | Vertebrata |
Classe | Mammalia |
Clade | Theriiformes |
Les Symmetrodonta sont un ordre de mammifères du Mésozoïque.
Liste de familles et genres
- Famille Kuehneotheriidae
- Genre Kuehneotherium
- Genre Delsatia
- Genre Kotatherium
- Famille Spalacolestidae
- Famille Spalacotheriidae
- Genre Spalacotherium
- Genre Shalbaatar
- Famille Tinodontidae
- Genre Tinodon
- Genre Gobiotheriodon
- Famille Woutersiidae
- Genre Woutersia
- Famille Kuehneotheriidae