With EXCEPTIONAL preservation and detail, this UPPER incisor fossil tusk comes from the prehistoric GIANT BEAVER, Castoroides. It is a SUPREME specimen, rarely seen in this complete condition and preservation. Premium examples of a Castoroides fossil tusk are coveted by all that collect Pleistocene North American fossils. The main incisors are the most requested fossil of this fascinating extinct giant animal. FINE QUALITY fossil remains of giant beaver are very difficult to ever find on the market.
Every detail is perfectly preserved with an extraordinary, naturally lustrous enamel of jet black hues with faint cream mottling! The complete and unbroken chewing wear facet is evident from rubbing against the opposing tusk.
Castoroides, or giant beaver, is an extinct genus of enormous, bear-sized beavers that lived in North America during the Pleistocene. Two species are currently recognized, C. dilophidus in the Southeastern US and C. ohioensis in the rest of its range. C. leiseyorum was previously described from the Irvingtonian of Florida, but is now regarded as an invalid name. All species previously described as C. leiseyorum are considered to belong to C. dilophidus.
Prehistoric giant beavers were much larger than modern beavers. Their average length was approximately 1.9 m (6.2 ft), and they could grow as large as 2.2 m (7.2 ft). The weight of the giant beaver could vary from 90 kg (198 lb) to 125 kg (276 lb). This makes it the largest known rodent in North America during the Pleistocene and the largest known beaver to have ever lived.
One of the defining characteristics of the giant beaver was their incisors, which differ in size and shape from those of modern beavers. Modern beavers have incisor teeth with smooth enamel, while the teeth of the giant beaver were much larger up to 15 cm (6 in) long, with a striated, textured enamel surface.
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