Original diagnosis "Primitive Cricetinae with cricetodontoid structure, in which all the cusps and crests that connect them have practically the same height, even in unworn teeth." (Translated from French.) Emended diagnosis Cricetinae with labial and lingual cusps, and connecting crests equally high. Valleys wide, and metaconid, entoconid, paracone and metacone crest-like. Wear surface turns into a flat, confluent pattern at an early stage of wear. Mesoloph(id)s absent. Posterosinusid not closed by posterolophid in M 1 and M2, frequently closed in M3 . M' with 3 roots.
Rotundomys montisrotundi (Schaub, 1944) Holotype M 1 sin., A Mo 849, Naturhistorisches Museum Basel, figured in Mein (1966). Type-locality Montredon niveau DepĂŠret (HĂŠrault, France) Other localities Can Llobateres, Can Casablanques (AgustI, 1981). Original diagnosis "...characteristic is a strong cingulum on the outer side, descending from the protoconid, and closing the sinusid. The metalophulid continues into the hind arm of the protoconid, so that there is no longer a typical longitudinal crest. The metalophulid runs obliquely forward, the labial anterolophid encloses a wide valley at the anteroexternal corner of the crown." (Translated from German.) Emended diagnosis "In all teeth the cusps and crests that connect them have practically the same height; the valleys are closed by low cingulum ridges. No mesolophid, mesoloph only present in M 2 and M3 , connected to the metacone. In M 1 and M2 the protoconid is directly connected to the entolophid, forming a regularly curved crest. The posterior metalophule is very much backwards, and the metalophulid point strongly forwards." (Translated from French, after Mein, 1966.)