Symmetrodonta Totally Explained

Everything about Symmetrodonta totally explained

Symmetrodonta is a basal group of Mesozoic mammals characterized by the triangular aspect of the molars 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 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 don't represent a discrete phylogenetic category, but with a series of intermediates between triconodonts, on the one hand, and dryolestoids and therians, on the other. At least some genera of symmetrodonts may even be true therians and part of the (disputed) clade Trituberculata. Particular sub−groups of Symmetrodonta are better studied, for example Spalacotheriidae, which has acute−angled molariform teeth, strongly reduced talonids, and conspicuous anterior and posterior cingulids.

Classification

Order SYMMETRODONTA

Family Kuehneotheriidae
- Genus Kuehneotherium
- Genus Delsatia
- Genus Kotatherium
Family Shuotheriidae
Family Spalacolestidae
Family Spalacotheriidae
- Genus Spalacotherium
- Genus Shalbaatar
Family Tinodontidae
- Genus Tinodon
- Genus Gobiotheriodon

Further Information

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