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Castor sp. (3) - tooth

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Description

fossil incisor tooth of beaver, mm 26 x 8.

Castoridae is a family of mammals rodents. At one time is extremely varied and rich in species, now the family has one genus with two species, namely the current beavers. Castoridae, according to the fossil record, appeared during the late Oligocene (genus Agnotocastor) in America and Asia: these primitive beaver had tooth configuration apparently unsuitable to gnaw the wood, as it happens in their current family. However, it seems that they were also semi-aquatic habits. During the Miocene in Europe appears Steneofiber, the first belonging to the subfamily Castorinae,the same to whom are ascribed the two living species of beaver. In the Pleistocene there was the maximum diversification of the family: during this time evolve giant beavers, as Trogontherium Castoroides in Europe and North America.

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