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Propalaeocastor Temporal range: early Oligocene
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Castoridae
Tribe:	†Anchitheriomyini
Genus:	†Propalaeocastor Borissoglebskaya, 1967
Type species
†Propalaeocastor kazachstanicus
Species
†P. butselensis †P. irtyshensis †P. kazachstanicus †P. shevyrevae †P. zaissanensis
Synonyms
†Asteneofiber Kretzoi, 1974

Propalaeocastor is a poorly known extinct genus of beavers (family Castoridae) from the early Oligocene of Europe and Asia. Recently described material of a new species of Propalaeocastor, P. irtyshensis, indicates the genus is probably the earliest known member of the subfamily Castorinae, which includes all castorids more closely related to living beavers (genus Castor) than to the extinct giant beaver (genus Castoroides). Previously, Propalaeocastor had been allied with more basal beavers such as Agnotocastor and Anchitheriomys. According to Wu and coauthors, Propalaeocastor, specifically P. butselensis, is the likely ancestor of the better-known Eurasian castorine Steneofiber.

References

1. Wu, W., Meng, J., Ye, J. and Ni, X. 2004. Propalaeocastor (Rodentia, Mammalia) from the early Oligocene of Burqin Basin, Xinjiang. American Museum Novitates 3461:1-16.
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

v t e Castorimorpha
Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Rodentia
Castorimorpha Diplolophidae †Diplolophus †Floresomys †Griphomys †Jimomys †Meliakrouniomys †Schizodontomys †Texomys Castoroidea Castoridae †Migmacastor †Agnotocastorinae †Agnotocastorini Agnotocastor Neatocastor †Anchitheriomyini Anchitheriomys Oligotheriomys Propalaeocastor †Palaeocastorinae Capacikala Palaeocastor Pseudopalaeocastor †Euhapsini Euhapsis Fossorcastor †Castoroidinae Priusaulax †Castoroidini Castoroides Dipoides Monosaulax Procastoroides Prodipoides †Nothodipoidini Eucastor Microdipoides Nothodipoides †Trogontheriini Asiacastor Boreofiber Euroxenomys Trogontherium Youngofiber Castorinae Castor †Chalicomys †Hystricops †Romanofiber †Schreuderia †Sinocastor †Steneofiber †Zamolxifiber †Eutypomyidae Eutypomys Janimus Mattimys Microeutypomys †Rhizospalacidae Rhizospalax
Geomorpha †Eomyidae Simiacritomys Symplokeomys †Apeomyinae Apeomyoides Apeomys Arikareeomys Megapeomys Zophoapheomys †Eomyinae Adjidaumo Aguafriamys Asianeomys Aulolithomys Centimanomys Comancheomys Cristadjidaumo Cupressimus Eomyodon Eomyops Eomys Estramomys Japaneomys Kansasimys Keramidomys Leptodontomys Ligerimys Metadjidaumo Metanoiamys Meteomys Montanamus Namatomys Neoadjidaumo Orelladjidaumo Paradjidaumo Paranamatomys Pentabuneomys Protadjidaumo Pseudotheridomys Rhodanomys Ritteneria Ronquillomys Viejadjidaumo †Yoderimyinae Litoyoderimys Yoderimys Zaisaneomys Zemiodontomys Geomyoidea †Griphomys †Meliakrouniomys †Florentiamyidae Ecclesimus Fanimus Florentiamys Hitonkala Kirkomys Sanctimus †Heliscomyidae Apletotomeus Heliscomys Passaliscomys Tylionomys Heteromyidae Dipodomyinae †Aurimys Dipodomys Microdipodops Heteromyinae †Diprionomys Heteromys †Metaliomys Perognathinae Chaetodipus Perognathus Geomyidae †Entoptychinae Entoptychus Gregorymys Pleurolicus Ziamys Geomyinae Cratogeomys Geomys Heterogeomys Orthogeomys Pappogeomys Thomomys Zygogeomys

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