Dipoides: Difference between revisions
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'''''Dipoides''''' is an extinct [[genus (biology)|genus]] of beaver-grouped [[rodent]]s. |
'''''Dipoides''''' is an extinct [[genus (biology)|genus]] of beaver-grouped [[rodent]]s.<ref name=OnceHats/> |
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Dipoides were about two thirds the size of modern [[Canadian Beavers]].<ref name=OnceHats/> Where modern beavers have square chisel shaped teeth, Dipoides teeth were rounded. However an excavation of a site that was once a marsh, in [[Ellesmere Island]], showed signs that they dined on bark and young trees, like modern beavers. The excavation seemed to show that, like modern beavers, Dipoides dammed streams.<ref name=Eager/> |
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[[Natalia Rybczynski]], of the [[Canadian Museum of Nature]], analyzed the teeth, and wood chips, of modern beavers, and Dipoides.<ref name=OnceHats/> She concluded that they all used just one of their teeth at a time, when cutting down trees. She concluded that modern beavers square teeth required half as many bites as Dipoides less evolved round teeth. |
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Rybczynski argues that eating bark and building dams are unlikely to have evolved twice, so modern beavers and Dipoides shared a wood eating common ancestor, 24 million years ago.<ref name=OnceHats/><ref name=Eager/> |
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==References== |
==References== |
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{{Reflist |
{{Reflist|refs= |
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<ref name=OnceHats> |
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{{cite book |
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| url = https://books.google.ca/books?id=wXkuCQAAQBAJ&printsec=frontcover&dq=%22once+they+were+hats%22+dipoides&hl=en&sa=X&ved=0ahUKEwjdjoTnwIffAhUK0FkKHZUuBmgQ6AEILDAA#v=onepage&q=%22once%20they%20were%20hats%22%20dipoides&f=false |
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| title = Once They Were Hats: In Search of the Mighty Beaver |
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| author = Frances Backhouse |
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| publisher = [[ECW/ORIM]] |
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| year = 2015 |
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| isbn = 9781770907553 |
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| accessdate = 2018-12-04 |
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| deadurl = No |
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</ref> |
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<ref name=Eager> |
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{{cite book |
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| url = https://books.google.ca/books?id=k-VfDwAAQBAJ&pg=PA22&dq=%22once+they+were+hats%22+dipoides&hl=en&sa=X&ved=0ahUKEwjdjoTnwIffAhUK0FkKHZUuBmgQ6AEIMjAB#v=onepage&q=%22once%20they%20were%20hats%22%20dipoides&f=false |
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| title = Eager: The Surprising, Secret Life of Beavers and Why They Matter |
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| author = Ben Goldfarb |
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| publisher = [[Chelsea Green Publishing]] |
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| year = 2018 |
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| isbn = 9781603587402 |
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| page = 22 |
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| accessdate = 2018-12-04 |
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| deadurl = No |
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}} |
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</ref> |
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* McKenna, Malcolm C., and Bell, Susan K. 1997. ''Classification of Mammals Above the Species Level''. Columbia University Press, New York, 631 pp. {{ISBN|0-231-11013-8}} |
* McKenna, Malcolm C., and Bell, Susan K. 1997. ''Classification of Mammals Above the Species Level''. Columbia University Press, New York, 631 pp. {{ISBN|0-231-11013-8}} |
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Revision as of 02:18, 5 December 2018
| Dipoides | |
|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Rodentia |
| Family: | Castoridae |
| Tribe: | †Castoroidini |
| Genus: | †Dipoides Schlosser, 1902 |
Dipoides is an extinct genus of beaver-grouped rodents.[1]
Dipoides were about two thirds the size of modern Canadian Beavers.[1] Where modern beavers have square chisel shaped teeth, Dipoides teeth were rounded. However an excavation of a site that was once a marsh, in Ellesmere Island, showed signs that they dined on bark and young trees, like modern beavers. The excavation seemed to show that, like modern beavers, Dipoides dammed streams.[2]
Natalia Rybczynski, of the Canadian Museum of Nature, analyzed the teeth, and wood chips, of modern beavers, and Dipoides.[1] She concluded that they all used just one of their teeth at a time, when cutting down trees. She concluded that modern beavers square teeth required half as many bites as Dipoides less evolved round teeth.
Rybczynski argues that eating bark and building dams are unlikely to have evolved twice, so modern beavers and Dipoides shared a wood eating common ancestor, 24 million years ago.[1][2]
References
- ^ a b c d
Frances Backhouse (2015). Once They Were Hats: In Search of the Mighty Beaver. ECW/ORIM. ISBN 9781770907553. Retrieved 2018-12-04.
{{cite book}}: Cite has empty unknown parameter:|trans_title=(help); Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ a b
Ben Goldfarb (2018). Eager: The Surprising, Secret Life of Beavers and Why They Matter. Chelsea Green Publishing. p. 22. ISBN 9781603587402. Retrieved 2018-12-04.
{{cite book}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help)
- McKenna, Malcolm C., and Bell, Susan K. 1997. Classification of Mammals Above the Species Level. Columbia University Press, New York, 631 pp. ISBN 0-231-11013-8
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