Dipoides is known from the Neogene of North America, Europe, and Asia (Flynn and Jacobs, 2008) and is a distant relative of Castor, whereas Castoroides
, the Pleistocene giant beaver, is more closely allied with Dipoides, according to the tooth pattern (Harington, 1996).
Estimates of how big the beaver Castoroides
ohioensis was range from a sizable 60 kilograms on up to the bulk of a modern black bear.
The only extinct form known to be thus associated is Castoroides
, a giant beaver, reported by Hay from the town of Adrian, Lenawee County.
Palaeoecology of a northeast Indiana wetland harboring remains of the Pleistocene giant beaver (Castoroides
The giant beaver Castoroides
ohioensis roamed North America near the end of the last ice age.
Fossils of giant beaver (Castoroides
) thought to be of last interglacial age have been found in the Old Crow region, northern Yukon, where they may have coexisted with modern beaver (Harington, 1978).
For example, turtles were recovered at the Christensen site in central Indiana associated with Mammuc, Rangifer, and Castoroides
at about 13,000 B.P.
Recovery of a femur of an adult Pleistocene giant beaver (Castoroides
ohioensis) from a cornfield in Whitley County, Indiana, prompted an analysis of the palaeoecology of the site.
Thus, the discovery of an extinct giant beaver (Castoroides
ohioensis) jaw, only the tenth record of this species from the state, and north of previous records, is important.
The presence of Megalonyx jeffersonii at higher latitudes in the western part of its range than in the east parallels the distribution seen in the stag-moose Cervalces scotti, the giant beaver Castoroides
ohioensis, and the helmeted muskox Bootherium bombifrons.
For example, turtles were recovered at the Christensen site in central Indiana associated with Mammut, Rangifer, and Castoroides
at about 13,000 B.P.
Measurements of Ludington, Michigan, Castoroides
canadensis Right Dentary Length of tooth row 74 mm Greatest length of lower molar II 18 mm Greatest length of lower molar III 16 mm Greatest length of mandibular symphasis 75 mm Greatest length, tip of jaw through condyloid process 202 mm Greatest length of alveolus I 22 mm Greatest length of alveolus IV 22 mm Greatest width of alveolus I 26 mm Greatest width of alveolus IV 18 mm