GEOMYIDAE INDET.

Maguire, Kaitlin Clare & Schmitz, Joshua X. Samuels and Mark D., 2022, The fauna and chronostratigraphy of the middle Miocene Mascall type area, John Day Basin, Oregon, USA, PaleoBios 35, pp. 1-51 : 19

GEOMYIDAE INDET.

Referred specimen —Dentary fragment with p4 through m2, JODA 3770.

Occurrence —UCMP -3043.

Description —The m1 and m2 of this specimen are broken down the middle but remain largely intact. All three teeth are heavily worn. The metalophid on the p4 is wide, flattened anteriorly and has broad connection with the hypolophid. The hypolophid has three cusps. This specimen is placed in Geomyidae based on the premolar’s larger size than the molars.

Remarks —This specimen is similar to the entoptychine, Gregorymys Wood, 1936 , by having p4 longer than the m1 and a hypolophid with three cusps ( Flynn et al. 2008). It is unlike the geomyine, Parapliosaccomys Shotwell, 1967 , because the metalophid is wide, and it is too small to be Geomys Rafinesque, 1817 . JODA 3770 could be Gregorymys , but there is no anterior cingulum on the p4; however, that character is known to be variable in the genus ( Flynn et al. 2008).