查看“︁副磨齒獸”︁的源代码

{{Automatic taxobox
| taxon = Paramylodon
| authority = [[巴納姆·布郎|Brown]], 1903
| fossil_range = [[上新世]]至[[更新世]]{{fossil range|4.9|0.011}}
| image = Glossotherium harlani p1350719.jpg
| image_caption = [[哈倫氏副磨齒獸]]
| subdivision_ranks = [[種]]
| subdivision =
* †''P. garbanii''
* †[[哈倫氏副磨齒獸]] ''P. harlani''
* †''P. nebrascensis''
}}

'''副磨齒獸'''（[[學名]]：''{{lang|la|Paramylodon}}''）是[[墨西哥]]及[[美國]]已[[滅絕]]的一[[屬]][[地懶]]。副磨齒喉的[[皮膚]]下有真皮小骨，可以提供一定程度的保護。

==分類歷史==
[[巴納姆·布朗]]於1903年以''P. nebrascensis''創立了[[副磨齒獸屬]]。牠們的[[頭顱骨]]像當時分類在[[磨齒獸]]的[[哈倫氏副磨齒獸]]（''M. harlani''）的頭顱骨，但上頜的[[牙齒]]數量不同，副磨齒獸就有4隻，而哈倫氏副磨齒獸的則有5隻。後來在[[拉布雷亞瀝青坑]]發現了大量''P. nebrascensis''的標本，當中一些沒有了像[[犬齒]]的牙齒，一些則有，故''P. nebrascensis''被認為是哈倫氏副磨齒獸的[[異名]]。<ref name=Stock1925>{{Cite journal en|author=Stock, C.|year=1925|title=Cenozoic gravigrade edentates of western North America with special reference to the Pleistocene Megalonychinae and Mylodontidae of Rancho La Brea|journal=Carnegie Institute of Washington|volume=331|pages=1-206}}</ref>據此確定了哈倫氏副磨齒獸的[[齒式]]為<math>5/4</math>。後來在處理磨齒獸及{{link-en|舌懶獸|Glossotherium}}的分類問題時，確認了副磨齒獸在[[遺傳]]上與[[南美洲]]磨齒獸的不同，並將哈倫氏副磨齒獸定為[[模式種]]。<ref>{{Cite journal en|author=Kraglievich, L.|year=1928|title=''Mylodon Darwin''" Owen, es la especie genotipo de "''Mylodon''" Ow|journal=Revista de la Sociedad Argentina de Ciencias Naturales, Physis|volume=9|issue=33|pages=169-85}}</ref>

副磨齒獸以往都分類為舌懶獸的[[亞種]]。<ref name=Robertson1976>{{Cite journal en|author=Robertson, J.|year=1976|title=Latest Pleistocene mammals from Haile XV A, Alachua County, Florida|journal=Bulletin of the Florida State Museum|volume=20|issue=3|pages=111-86}}</ref>後來也確認了副磨齒獸在遺傳上也是與舌懶獸有所不同。<ref name=McAfee2007>McAfee, R.K. (2007): ''Reassessing the Taxonomy and Affinities of the Mylodontinae Sloths, Glossotherium and Paramylodon (Mammalia: Xenarthra: Tardigrada)''. Ph.D. Dissertation, Northern Illinois University. DeKalb, IL: 177pp.</ref>

==主要發現==
最近在[[愛荷華州]]發現的[[哈倫氏副磨齒獸]]是連同[[杰氏巨爪地懶]]一同被發現。這是第一次在愛荷華州發現副磨齒獸，也可能是第一次發現這兩類生物的緊密關聯。<ref>{{Cite web |url=http://slothcentral.com/archives/529/comment-page-1#comment-1787 |title="Fourth sloth discovered", comment on ''The Tarkio Valley Sloth Project'' |accessdate=2009-09-25 |archive-date=2011-07-16 |archive-url=https://web.archive.org/web/20110716095433/http://slothcentral.com/archives/529/comment-page-1#comment-1787 |dead-url=no }}</ref>

==參考==
{{Reflist}} 
* {{aut|Brown, B.}} (1903): A new genus of ground sloth from the Pleistocene of Nebraska. ''Bulletin of the American Museum of Natural History'', 19:569-583.
* {{aut|Harlan, R.}} (1935): Medical and physical researches. pp.&nbsp;271-275; 314-336.

==外部連結==
*[http://www.sloth-world.org Sloth World] {{Wayback|url=http://www.sloth-world.org/ |date=20130502202941 }}
*[https://web.archive.org/web/20040206222938/http://www.tarpits.org/education/guide/flora/sloth.html Page Museum]
{{披毛目|P.}}
{{taxonbar}}
[[Category:磨齒獸科|F]]
[[Category:副磨齒獸屬|F]]
[[Category:上新世哺乳类|F]]
[[Category:更新世哺乳类|F]]
[[Category:北美洲史前哺乳動物|F]]
[[Category:1903年描述的分类群|F]]
[[Category:墨西哥化石]]