Desmostylidae
| Desmostylidae Temporal range: Early Oligocene to Miocene,
| |
|---|---|
| Desmostylus, Royal Ontario Museum | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Desmostylia |
| Family: | †Desmostylidae Osborn 1905 |
Desmostylidae is an extinct family of herbivorous marine mammals belonging to the order of Desmostylia. They lived in the coastal waters of the northern Pacific Ocean from the Early Oligocene (Rupelian) through the Late Miocene (Tortonian) (33.9 mya—7.2 MYA),[1][2] existing for approximately 26.7 million years.
Taxonomy and systematics
Desmostylidae was named by Osborn 1905 and assigned to the order Desmostylia by McKenna and Bell in 1997.[1]
Cockburn & Beatty 2009 found a subadult specimen of Behemotops proteus on Vancouver Island in 2007. They noted that the cranial features of their specimen were similar to those of Cornwallius and that the adult dentition was not delayed in their specimen, unlike in Desmostylus and other Afrotheria, and they concluded that Desmostylidae and Paleoparadoxiidae probably diverged earlier than previously believed and that delayed dentition can not be the most primitive state of Desmostylia.[3]
Ichnology
Trace fossils most likely produced by desmostylids are known in the form of Piscichnus waitemata from the Shirahama Formation of Japan. They were likely made by desmostylids using their oral pump to generate water flows while foraging.[4]
Classification
Classification after Chiba 2016:[2]
- †Desmostylidae:
References
- ^ a b Desmostylidae in the Paleobiology Database. Retrieved April 2020.
- ^ a b K. Chiba, A. R. Fiorillo, L. L. Jacobs, Y. Kimura, Y. Kobayashi, N. Kohno, Y. Nishida, M. J. Polcyn, and K. Tanaka. 2016. A new desmostylian mammal from Unalaska (USA) and the robust Sanjussen jaw from Hokkaido (Japan), with comments on feeding in derived desmostylids. Historical Biology 28(1-2):289-303
- ^ Cockburn & Beatty 2009, Abstract
- ^ Nara, Masakazu; Imai, Satoru; Fujino, Shigehiro (26 September 2025). "Well-preserved Piscichnus waitemata in tidal-flat deposits of the Miocene Shirahama Formation, southwestern Japan and its ichnological, palaeoecological, and palaeontological implications". Ichnos: 1–9. doi:10.1080/10420940.2025.2565208. ISSN 1042-0940. Retrieved 2 October 2025 – via Taylor and Francis Online.
- Cockburn, Thomas; Beatty, Brian (2009). "A Partial Skeleton of Behemotops (Desmostylia, Mammalia) from Vancouver Island, British Columbia" (PDF). Journal of Vertebrate Paleontology. 29 (3, Supplement). doi:10.1080/02724634.2009.10411818. Retrieved 9 May 2020.
- McKenna, Malcolm C.; Bell, Susan K. (1997). Classification of Mammals Above the Species Level. New York: Columbia University Press. ISBN 0231110138. OCLC 37345734.
- Osborn, H. F. (1905). "Ten years progress in the mammalian Palaeontology of North America". Extrait des Comptes rendus du 6e Congres international de Zoologie. Session de Berne 1904: 86–113. OCLC 18502464.