Florentiamyidae is a family of extinct

rodents Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia ( ), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are n ...

from North America. They are part of the Superfamily

Geomyoidea Geomyoidea is a superfamily of rodent that contains the pocket gophers ( Geomyidae), the kangaroo rats and mice ( Heteromyidae), and their fossil relatives. Characteristics Although dissimilar in overall appearance, gophers have been united wit ...

according to R. L. Carroll 1988. They are known to have existed 33.3 to 15.97 mya. They are known from the

Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...

of United States, Harrisonian of United States,

Arikareean The Arikareean North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 30,600,000 to 20,800,000 years BP, a period of . It is usuall ...

of United States, and

Oligocene The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period that extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that defin ...

of Canada. Four fossil specimens from the Arikareean were obtained at the John Day Fossil Beds in

Oregon Oregon ( , ) is a U.S. state, state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington (state), Washington, while t ...

References

Geomyoid rodents Eocene rodents Eocene Perissodactyla Eocene mammals of North America Paleogene geology of Oregon Prehistoric rodent families John Day Fossil Beds National Monument Extinct rodents Extinct mammals of North America Eocene first appearances Eocene extinctions Rupelian first appearances Miocene extinctions {{geomyidae-stub