Biology:Trogosus
Trogosus is an extinct genus of tillodont mammal. Fossils have been found in Wyoming,[1] California,[2] and British Columbia,[3] and date from the Eocene between 54.8 and 33.7 million years ago.
Description
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).[4] 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.[5] 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.[1]
Notes
- ↑ 1.0 1.1 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" (in en). Journal of Anatomy 244 (1): 1–21. doi:10.1111/joa.13951. ISSN 0021-8782. 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). doi:10.1080/02724634.2016.1089878. Bibcode: 2016JVPal..36E9878M. https://www.tandfonline.com/doi/full/10.1080/02724634.2016.1089878. Retrieved 11 April 2022.
- ↑ Russell 1935
- ↑ Kemp 2005, p. 240
- ↑ Palmer 1999, p. 236
References
- Kemp, Tom S. (2005). The Origin and Evolution of Mammals. Oxford University Press. ISBN 0-19-850761-5. OCLC 56652579.
- "Remains of extinct mammals from Wyoming". Proceedings of the Academy of Natural Sciences 23: 113–116. 1871. https://archive.org/stream/proceedingsofacad23acad#page/114/mode/2up. 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. doi:10.2475/ajs.s5-29.169.54. Bibcode: 1935AmJS...29...54R.
Template:Eutheria Wikidata ☰ Q599076 entry
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