Trechnotheria
Trechnotheria is a group of mammals that includes the therians and some fossil mammals from the Mesozoic Era. In the Jurassic through Cretaceous periods, the group was only found in the area which is now modern Asia and Africa.[2]
| Trechnotheria Temporal range: Late Triassic - Holocene,
| |
|---|---|
| File:Kangaroo and joey03.jpg | |
| Kangaroo with her joey | |
| Scientific classification e | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Theriiformes |
| Clade: | Trechnotheria McKenna, 1975 |
| Subgroups[1] | |
| |
When the group Trechnotheria was first defined, it was said to be a "superlegion". Since then it has been given many different ranks.[3] Later, a definnition based on nodes was created for Trechnotheria. This clade was imcluded the last common ancestor of Zhangheotherium and living therian mammals and all of its descentants.[4]
Characteristics
Like most mammal groups from the Mesozoic Era, early trechnotherians are known mainly from their teeth. One of the features of this group which is the most noticable is their large teeth. The features of the shoulder blade, tibia, humerus, and ankle joint are also used to define which animals are in this clade.[1]
Trechnotheria Media
- Fruitafossor BW.jpg
Fruitafossor windscheffeli, an early termite-eating mammal from the Late Jurassic of Colorado, digital
Jeholodens jenkinsi, a triconodont mammal from the Middle Cretaceous of China, pencil drawing, digital coloring
- Tinodon bellus.png
Eight lower jaw of Tinodon bellus, Marsh; inner view.
- Zhangheotherium quinquecuspidens.jpg
Zhangheotherium quinquecuspidens
- Akidolestes.jpg
Akidolestes skeleton
- Cronopio.svg
Diagram of the skull of Cronopio an extinct mammal from the Late Cretaceous of South America, based on figures in "Highly specialized mammalian skulls from the Late Cretaceous of South America" by Guillermo W. Rougier, Sebastián Apesteguía & Leandro C. Gaetano, published in 2011 in Nature. Skull is depicted in top down (upper) and side on (lower) views. Scale bar = 5 mm
- Henkeloth.jpg
Reprodução do esqueleto de um Henkelotherium guimarotae, com c.5cm, exposto no Museo Geológico de Lisboa (Portugal).
- Artistic reconstruction of Vincelestes.PNG
Artistic reconstruction of Vincelestes
Related pages
References
- ↑ 1.0 1.1 Lua error in Module:Citation/CS1/Utilities at line 38: bad argument #1 to 'ipairs' (table expected, got nil).
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- ↑ Lua error in Module:Citation/CS1/Utilities at line 38: bad argument #1 to 'ipairs' (table expected, got nil).
- ↑ Lua error in Module:Citation/CS1/Utilities at line 38: bad argument #1 to 'ipairs' (table expected, got nil).