Ivanantonia

Taxobox
name = "Ivanantonia"
fossil_range = early Eocene
regnum = Animalia
phylum = Chordata
classis = Mammalia
ordo = Rodentia
familia = †Ivanantoniidae
familia_authority = Shevyreva, 1989
genus = †"Ivanantonia"
genus_authority = Shevyreva, 1989
species = †"I. efremovi"
binomial = †"Ivanantonia efremovi"
binomial_authority = Shevyreva, 1989

"Ivanantonia" is the only genus in the extinct rodent family Ivanantoniidae and is represented by a single species, "Ivanantonia efremovi", from the early Eocene of Mongolia. "Ivanantonia" is poorly known, with only the lower dentition represented. The genus is unusual among early rodents in lacking all lower premolars and in showing evidence of propalinal chewing (Hartenberger et al., 1997). The relationships of "Ivanantonia" are unclear. It was described as a ctenodactyloid (Shevyreva, 1989). Hartenberger et al. (1997) suggested a potential relationship to the muroid "Nonomys" but declined to assign Ivanantoniidae to a suborder within Rodentia.

References

*Hartenberger, J.-L., D. Dashzeveg, and T. Martin. 1997. What is "Ivanantonia efremovi" (Rodentia, Mammalia)? Paläontologische Zeitschrift, 71(1/2): 135-143.
*Shevyreva, N.S. 2007. 1989. New rodents (Ctenodactyloidea, Rodentia, Mammalia) from the Lower Eocene of Mongolia. Paleontological Journal, 3: 60-72.