Pekania is a genus of mustelid that contains a single living species, the fisher (Pekania pennanti). Formerly placed in the genus Martes, it was determined to be distinct enough to be placed within its own genus. A 2013 study also identified several fossil species formerly in Martes that are more closely related – and probably ancestral – to the fisher, moving them into Pekania as well.[1]
| Pekania | |
|---|---|
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| Fisher (Pekania pennanti) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Carnivora |
| Family: | Mustelidae |
| Subfamily: | Guloninae |
| Genus: | Pekania Gray, 1865 |
| Type species | |
| Martes pennanti Erxleben, 1777
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| Species | |
Taxonomy
editThe fisher was for many years placed in the genus Martes. A 2008 study using DNA sequences found the remaining species of Martes to be more closely related to the wolverine (genus Gulo) than to the fisher, rendering Martes paraphyletic. Therefore, the fisher was reclassified in the separate genus Pekania.[2] Current studies suggest that the fisher is more closely related to the wolverine and tayra than it is to martens, confirming its placement in the separate genus.[1]
Evolution
editThe earliest known fossil member of Pekania is P. occulta from the Rattlesnake Formation of Oregon, which is about 7 million years old but already very similar to the fisher.[1] Although endemic to North America today, Pekania may also have occurred in Asia in the past, with the first species known from between 2.5 and 5.0 million years ago. Two extinct members of the genus known from East Asia are Pekania palaeosinensis and P. anderssoni, though P. anderssoni is often considered to be a synonym of P. palaeosinensis. Another North American member of the genus, P. diluviana, has only been found in Middle Pleistocene North America. P. diluviana is strongly indicated to be related to the Asian finds, which suggests a migration. The modern fisher has been found as early as the Late Pleistocene era, about 125,000 years ago. No major differences are seen between the Pleistocene fisher and the modern fisher. Fossil evidence indicates that the fisher's range extended farther south than it does today.[3]
References
edit- ^ a b c d Samuels, J.X.; Cavin, J. (2013). "The earliest known fisher (Mustelidae), a new species from the Rattlesnake Formation of Oregon". Journal of Vertebrate Paleontology. 33 (2): 448–454. doi:10.1080/02724634.2013.722155. S2CID 42079934.
- ^ Koepfli, Klaus-Peter; Deere, Kerry A; Slater, Graham J; Begg, Colleen; Begg, Keith; Grassman, Lon; Lucherini, Mauro; Veron, Geraldine; Wayne, Robert K (February 14, 2008). "Multigene phylogeny of the Mustelidae: Resolving relationships, tempo and biogeographic history of a mammalian adaptive radiation". BMC Biology. 6 (10): 10. doi:10.1186/1741-7007-6-10. PMC 2276185. PMID 18275614.
- ^ Powell, R.A. (May 8, 1981). "Martes pennanti" (PDF). Mammalian Species (156). The American Society of Mammalogists: 1–6. doi:10.2307/3504050. JSTOR 3504050. Archived from the original (PDF) on 2005-10-30. Retrieved October 21, 2011.