Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Neodon sikimensis Horsfield 1841 Neodon sikimensis Horsfield 1841 , A Catalogue of the Mammalia in the Museum of the Hon. East-India Company: 145-146 (as corrected by Kaneko and Smeenk, 1996 ; not Hodgson, 1849, as entrenched in the literature) . Type Locality: India , Sikkim . Vernacular Names: Sikkim Mountain Vole . Synonyms: Neodon thricolis (Gray 1863) . Distribution: Himalayas from W to E Nepal (based on FMNH series), through NE India ( Sikkim and Darjeeling Dist.) to E Bhutan ( Ellerman, 1947 a , 1961); also SC and E Xizang (Tibet; Feng et al., 1986 ; Zhang et al., 1997 ). Conservation: IUCN – Lower Risk (lc) as Microtus sikimensis . Discussion: Geographic distribution of N. sikimensis on the E Tibetan Plateau is parapatric with the smaller-bodied and morphologically different N. irene (see account), once included in N. sikimensis . Banded karyotype (2n = 48, FN = 56) described by Mekada et al. (2002) , who postulated its derivation from that characterizing N. juldaschi (as Microtus carruthersi ). Indian population reviewed by Agrawal (2000) ; aspects of habitat, individual and age variation reported by Abe (1971) and Gruber (1969) .