Besides genus *Chinchilla*, what is the other extant genus in family Chinchillidae?
Answer
*Lagidium*
The family Chinchillidae, which is situated within the order Rodentia, is specifically noted to be divided into two distinct extant genera. One genus is *Chinchilla*, which includes the true chinchillas. The other genus that constitutes the second branch of this family grouping is *Lagidium*. The animals belonging to *Lagidium* are often referred to as mountain or tufted-eared chinchillas. This division signifies that although they are closely related enough to share a family designation, there are significant biological differences, comparable to the difference observed between a common house cat and a less familiar small wildcat, warranting separate genus classification.
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