| Trogosus | |
|---|---|
 | |
| Trogosus hyracoides skull at the National Museum of Natural History | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Tillodontia |
| Family: | †Esthonychidae |
| Subfamily: | †Trogosinae |
| Genus: | †Trogosus Leidy 1871 |
| Species[1] | |
| |
Trogosus is an extinct genus oftillodont mammal. Fossils have been found inWyoming,[2]California,[3] andBritish Columbia,[4] and date from theEocene between 54.8 and 33.7 million years ago.
Trogosus was abear-like herbivore with a large, shortskull and flat feet, and had a skull 35 cm (14 in) long with an estimated body weight of 150 kg (330 lb).[5] It had large,rodent-likeincisors, which continued growing throughout the creature's life. Judging from the heavily wornmolar teeth,Trogosus fed on rough plant material, such as roots and tubers.[6]Trogosus possessed an exposedmidbrain, a smallneocortex, an orbitotemporal canal ventral to rhinal fissure, large olfactory bulbs, and a broad circular fissure. Its tiny neocortex relative to contemporary carnivorans and artiodactyls may have disadvantaged it when escaping predation by the former and competing for resources with the latter.[2]
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