. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. A new social vole from Turkey 9 Comparisons. - For details on chromosomal differences between the new species and the three other social voles from Turkey (M guentheri, M. socialis, M. dogmmaci) see Kefelioglu & Krystufek (1999). The new species closely resembles M. socialis karyologically. The two share the same fundamental number of autosomes, but differ in diploid number: 2n = 62 in M socialis and 60 in M. anatoli- cus sp. The single small metacentric in
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. A new social vole from Turkey 9 Comparisons. - For details on chromosomal differences between the new species and the three other social voles from Turkey (M guentheri, M. socialis, M. dogmmaci) see Kefelioglu & Krystufek (1999). The new species closely resembles M. socialis karyologically. The two share the same fundamental number of autosomes, but differ in diploid number: 2n = 62 in M socialis and 60 in M. anatoli- cus sp. The single small metacentric in M. anatolicus sp. n. possibly resulted from a fusion of two small acrocentrics (Matthey 1973). However, categorical cranial differences provide strong evidence against restricting the new species to a merely Robertsonian population of M. socialis. Microtus guentheri (Danford & Alston, 1880) of western Anatolia is larger with a more robust skull but with shorter bullae and a narrower braincase (Fig. 6). More- over, all M guentheri we have examined so far were brown, whilst the new species is greyish. The exact scope of M. guentheri in eastern Anatolia and possibly in adjacent parts of Iran is far from clear. The topotypes of M. guentheri shevketi Neuhäuser, 1936 have a guentheri karyotype (Kefelioglu & Krystufek 1999) and Microtus philistinus morphologically fits M guentheri of western Anatolia (Fig. 6). The few specimens in our possession from eastern Anatolia with M. guentheri karyotype are smaller and with longer bullae compared to M guentheri from western Anatolia, but not differing cranially from M. cfr. irani. The latter differed from the new species by relatively smaller bullae, a narrower braincase (Fig. 7) and, judging from the Anatolian samples, also by karyotype. Microtus irani is characterised by a longer tail, more projecting upper incisors, relatively shorter bullae and a narrower braincase. Bullae breadth (BuB) attained of rostrum length (RoL) in M
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