Microtus (Stenocranius) gregalis (Pallas)
Fig. 34
Baculum: Length of stalk (2.4 mm.) 1¾, times greatest breadth, 41/3 times greatest depth; median ossified process well developed, more than 1/3 length of stalk, higher than wide, slightly bowed, closely appressed to terminus of shaft; basal tuberosities of stalk moderately developed, confluent medially, posterior profile of medial apex rounded in dorsal view, lateral indentations present, hence trilobate outline; in proximal end-view base wider ventrally, ventral concavity broader than dorsal concavity but of equal depth, medial constriction 2/3 greatest depth; shaft slender in distal part, inflated terminally, and wider than high at mid-point of stalk; lateral profile a smooth slope of gradually decreasing curvature from point of greatest width to near distal end.
The baculum of this species figured by Ognev (1950:461) differs in having lateral ossified processes, and a more rounded base of the stalk. Resemblance to the New World Stenocranius is discussed below.
Specimen examined: One from "Eastern Europe," 8059.