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Trogosus
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| Trogosus Temporal range:
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|---|---|
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| Trogosus hyracoides skull at the National Museum of Natural History | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Tillodontia |
| Family: | †Esthonychidae |
| Subfamily: | †Trogosinae |
| Genus: | †Trogosus Leidy 1871 |
| Species[1] | |
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Trogosus is an extinct genus of tillodont mammal. Fossils have been found in Wyoming,[2] California,[3] and British Columbia,[4] and date from the Eocene between 54.8 and 33.7 million years ago.
Description
[edit]
Trogosus was a bear-like herbivore with a large, short skull 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-like incisors, which continued growing throughout the creature's life. Judging from the heavily worn molar teeth, Trogosus fed on rough plant material, such as roots and tubers.[6] Trogosus possessed an exposed midbrain, a small neocortex, 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]
Notes
[edit]- ^ Trogosus in the Paleobiology Database. Retrieved July 2013.
- ^ a b Bertrand, Ornella C.; Jiménez Lao, Marina; Shelley, Sarah L.; Wible, John R.; Williamson, Thomas E.; Meng, Jin; Brusatte, Stephen L. (18 September 2023). "The virtual brain endocast of Trogosus (Mammalia, Tillodontia) and its relevance in understanding the extinction of archaic placental mammals". Journal of Anatomy. 244 (1): 1–21. doi:10.1111/joa.13951. ISSN 0021-8782. PMC 10734658. PMID 37720992.
- ^ Miyata, Kazunori; Deméré, Thomas A. (17 February 2016). "New material of a 'short-faced' Trogosus (Mammalia, Tillodontia) from the Delmar Formation (Bridgerian), San Diego County, California, U.S.A.". Journal of Vertebrate Paleontology. 36 (3) e1089878. Bibcode:2016JVPal..36E9878M. doi:10.1080/02724634.2016.1089878. S2CID 130776132. Retrieved 11 April 2022.
- ^ Russell 1935
- ^ Kemp 2005, p. 240
- ^ Palmer 1999, p. 236
References
[edit]- Kemp, Tom S. (2005). The Origin and Evolution of Mammals. Oxford University Press. ISBN 0-19-850761-5. OCLC 56652579.
- Leidy, J. (1871). "Remains of extinct mammals from Wyoming". Proceedings of the Academy of Natural Sciences. 23: 113–116. Retrieved July 24, 2013.
- Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. ISBN 1-84028-152-9.
- Russell, Loris Shano (1935). "A middle Eocene mammal from British Columbia". American Journal of Science. 5. 29 (169): 54–55. Bibcode:1935AmJS...29...54R. doi:10.2475/ajs.s5-29.169.54.
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