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Temporal range: Early Oligocene–Middle Miocene
Fossil jaw
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Suborder: Castorimorpha
Family: Castoridae
Subfamily: Castorinae
Genus: Steneofiber
Geoffroy, 1833
  • S. castorinus (Pomel, 1847) (type)
  • S. depereti Mayet, 1908
  • S. eseri (Meyer, 1846)
  • S. minutus (Meyer, 1838)
  • S. sansaniensis Gervais, 1859
  • S. wezensis Sulimski, 1964

Steneofiber is an extinct genus of beavers from Eurasia.

Steneofiber esseri

This small, 30-cm-long (1-ft-long) creature probably lived in large freshwater lakes, like present day beavers. A semiaquatic lifestyle is indicated by the presence of combing-claws, which living beavers use to waterproof their fur.[1] Most likely, it was incapable of bringing down trees like its modern relatives. Steneofiber was more terrestrial than modern beavers, living in burrows. The finding of a possible family group of Steneofiber skeletons in France has been used to infer that the genus employed a K-selected reproductive strategy like modern beavers, in which extensive parental care is given to a small number of offspring.[1] Steneofiber is among earliest known members of the subfamily Castorinae, which includes beavers more closely related to the two living species than to the recently extinct giant beaver.[2] It is probably descended from the earliest castorine, Propalaeocastor.[3]


  1. ^ a b Hugueney, M. & F. Escuillié (1995). "K-strategy and adaptative specialization in Steneofiber from Montaigu-le-Blin (dept. Allier, France; Lower Miocene, MN 2a, ±23 Ma): first evidence of fossil life-history strategies in castorid rodents". Palaeogeography, Palaeoclimatology, Palaeoecology. 113 (2–4): 217–225. doi:10.1016/0031-0182(95)00050-V. 
  2. ^ Korth, W.W. (2002). "Comments on the systematics and classification of the beavers (Rodentia, Castoridae)". Journal of Mammalian Evolution. 8 (4): 279–296. doi:10.1023/A:1014468732231. 
  3. ^ Wu, W., Meng, J., Ye, J. and Ni, X. (2002). "Propalaeocastor (Rodentia, Mammalia) from the early Oligocene of Burqin Basin, Xinjiang". American Museum Novitates. 3461: 1–16. doi:10.1206/0003-0082(2004)461<0001:PRMFTE>2.0.CO;2. hdl:2246/2771.