{"references": ["Kovalskaya, Yu. M., V. M. Malygin, I. V. Kartavtseva. 1988. [Karyotype stability and distribution of reed voles- - Microtus fortis (Rodentia, Cricetidae).] Zoologicheskii Zhurnal, 67: 1253 - 1259 (in Russian).", "Kovalskaya, Yu. M., V. M. Aniskin, and I. V. Kartavtseva. 1991. [Geographic variation of C-heterochromatin in Microtus fortis (Rodentia, Cricetidae).] Zoologicheskii Zhurnal, 70: 97 - 104 (in Russian).", "Radjabli, S. I., M. N. Meier, F. N. Golenishchev, and A. A. Isaenko. 1984. [Karyological peculiarities of the Mongolian vole and its relations within the subgenus Microtus (Rodentia, Cricetidae)]. Zoologicheskii Zhurnal, 63: 441 - 446 (in Russian).", "Zagorodnyuk, I. V. 1990. Kariotipicheskaya izmenchivost' i sistematika serykh polevok (Rodentia, Arvicolini). Soobshchenie 1. Vidovoi sostav i khromosomnye chisla [Karyotypic variability and systematics of the gray voles (Rodentia, Arvicolini). Communication 1. Species composition and chromosomal numbers]. Vestnik Zoologii, 2: 26 - 37 (in Russian).", "Corbet, G. B. 1978 c. The mammals of the Palaearctic region: A taxonomic review. British Museum (Natural History), London, 314 pp.", "Gromov, I. M., and I. Ya. Polyakov. 1977. Fauna SSSR, Mlekopitayushchie, tom 3, vyp. 8 [Fauna of the USSR, vol. 3, pt. 8, Mammals]. Polevki [Voles (Microtinae)]. Nauka, Moscow-Leningrad, 504 pp. (in Russian)."]}

Microtus fortis Büchner, 1889. Wiss. Res. Przewalski's Cent.- Asien. Reisen, Zool., I:(Säugeth.), p. 99. TYPE LOCALITY: China, Nei Mongol, Ordos Desert, Huang Ho Valley, Sujan. DISTRIBUTION: Transbaikalia and Amur region south through Nei Mongol and E China to lower Yangtse Valley and Fujian (see Kovalskaya et al., 1988). SYNONYMS: calamarum, dolichocephalus, fujianensis, michnoi, pelliceus, uliginosus. COMMENTS: Subgenus Alexandromys. Geographic variation in chromosomal traits and its significance was reported by Kovalskaya et al. (1988; 1991). Most researchers view this species as a close phylogenetic relative of M. mongolicus (Meier, 1983; Radjabli et al., 1984). Zagorodnyuk (1990) listed M. fortis as the only member of its species group and related to the M. middendorffi group, which contains M. middendorffi, M. miurus, M. mongolicus, and M. sachalinensis. Reviewed by Corbet (1978c) and Gromov and Polyakov (1977).

Published as part of Guy G. Musser & Michael D. Carleton, 1993, Order Rodentia - Family Muridae, pp. 501-755 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 521, DOI: 10.5281/zenodo.7353098