After McKenna & Bell, 1997

Alternative phylogeny of Castoridae after Korth, 2001

<==o Castorimorpha A.E. Wood, 1955 [Palmipedes Giebel, 1847; Palmipedia Van der Hoeven, 1858 (nomen oblitum)] (majavamaiset jyrsijät; beaver-like rodents)
   |-- †Eutypomyidae Miller & Gidley, 1918
   `--+-- †Rhizospalax Miller & Gidley, 1919; U.Olig. Eu. [Rhizospalacidae Thaler, 1966]
      `--o Castoridae Hemprich, 1820 [taxonomic history] (beavers; majavat)
         |?- †Eocastoroides Hibbard, 1937 [= Procastoroides?]; L.Plioc. NA.
         |?-o †Oligotheriomys Korth, 1998b
         |  `-- †O. senrudi (A.E. Wood, 1945) [Monosaulax senrudi A.E. Wood, 1945; Hystricops senrudi (Wood); Stout & Stone, 1971, and Cassiliano (1980); Monosaulax senrudi Wood, Korth, 1994c; Oligotheriomys senrudi (Wood); Korth, 1998a]
         |-- †Castoroidinae Allen, 1877 [taxonomic history]
         `-- Castorinae Hemprich, 1820 (aitomajavat)

Reference(s):