Fossorcastor fossor Peterson 1905 (beaver)

Mammalia - Rodentia - Castoridae

Alternative combinations: Palaeocastor fossor, Steneofiber fossor

Synonyms: Palaeocastor magnus Romer and McCormack 1928, Palaeocastor major Stirton 1935, Palaeocastor simplicidens Matthew 1907, Steneofiber simplicidens Matthew 1907

Full reference: O. A. Peterson. 1905. Description of New Rodents And Discussion Of The Origin of Daemonelix. Memoirs of the Carnegie Museum 2(4):139-202

Belongs to Fossorcastor according to X. Xu 1996

See also Macdonald 1970, Martin 1987, Matthew 1907, Peterson 1905, Romer and McCormack 1928, Stirton 1935 and Storer 2002

Sister taxa: Fossorcastor brachyceps, Fossorcastor greeni

Type specimens:

  • Fossorcastor fossor: CM 1217, a partial skeleton (cranium, the vertebral column, including eleven caudals, (the extreme tip of the tail is missing), both clavicles, and a fairly complete set of ribs). Its type locality is Pine Ridge Escarpment, which is in a Harrisonian terrestrial horizon in the Harrison Formation of Nebraska.
  • Palaeocastor magnus: Its type locality is Raw Hide Buttes (Lower Harrison), which is in a Harrisonian terrestrial horizon in Wyoming.
  • Palaeocastor major:
  • Steneofiber simplicidens: Its type locality is AMNH Rosebud 8, which is in an Arikareean terrestrial horizon in South Dakota.

Ecology: amphibious browser


• Miocene of United States (1: Texas collection)

• Harrisonian of United States (3: Nebraska)

• Arikareean of United States (1: South Dakota)

• Oligocene of United States (6: South Dakota)

Total: 11 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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