Allophaiomys is a relatively primitive arvicoline occurring approximately from 2.2 to 1.2 mya. It has been considered by some as a subgenus of Microtus and by others as a separate genus ancestral to Microtus (Kurtén and Anderson 1980, Martin and Tesakov 1998).
Rogers et al. (2000) reported a number of specimens from four of the oldest sites within SAM Cave. They stated that all except 2 of 67 identified specimens are of advanced Allophaiomys, the other two being of the "typical" type. They considered the SAM Cave populations as an unnamed, advanced species of the genus.
Medial Irvingtonian: SAM Cave (Rogers et al. 2000).
Literature. Kurtén and Anderson 1980; Martin and Tesakov 1998; Rogers et al. 2000.
Last Update: 26 Nov 2008