Order Soricomorpha 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 1 220 311 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Sorex (Sorex) tundrensis Merriam 1900 Sorex (Sorex) tundrensis Merriam 1900 , Proc. Wash. Acad. Sci., 2: 16 . Type Locality: USA , Alaska , St. Michaels. Vernacular Names: Tundra Shrew . Synonyms: Sorex (Sorex) amasari Ognev 1922 ; Sorex (Sorex) amazari Ognev 1928 ; Sorex (Sorex) baikalensis Ognev 1913 ; Sorex (Sorex) borealis Kastchenko 1905 ; Sorex (Sorex) centralis Thomas 1911 ; Sorex (Sorex) irkutensis Ognev 1933 ; Sorex (Sorex) jenissejensis Dudelski 1930 ; Sorex (Sorex) khankae Baranova and Zaitsev 2003 ; Sorex (Sorex) margarita Fetisov 1950 ; Sorex (Sorex) middendorfii Ognev 1933 ; Sorex (Sorex) parvicaudatus Okhotina 1976 ; Sorex (Sorex) petschorae Ognev 1922 ; Sorex (Sorex) schnitnikovi Ognev 1922 ; Sorex (Sorex) sibiriensis Ognev 1922 ; Sorex (Sorex) transrypheus Stroganov 1956 ; Sorex (Sorex) ultimus G. Allen 1914 ; Sorex (Sorex) ussuriensis Okhotina 1983 . Distribution: Sakhalin Isl; Siberia, from the Pechora River to Chukotka, south to the Altai Mtns; Mongolia and NE China ; Alaska ( USA ); Yukon , Northwest Territories ( Canada ). Conservation: IUCN – Lower Risk (lc). Discussion: Subgenus Sorex , S. tundrensis group ( Fumagalli et al., 1999 ). Youngman (1975) provided evidence that tundrensis is specifically distinct from arcticus . Palearctic populations formerly referred to arcticus were included in tundrensis by Junge et al. (1983) and Okhotina (1983) . Hoffmann (1987) and van Zyll de Jong (1991 b ) discussed additional aspects of its taxonomy and distribution. Karyotype variable: 2n = 31-41, FN 56-60 in Siberia, 2n = 32/33, FN = 58 in Yukon , and 2n = 32/33, FN = 62 in C Alaska. Kozlovsky (1976) found irkutensis and sibiriensis to be karyotypically distinct; possibly two sibling species occur throughout the Palearctic range. Meylan and Hausser (1991) described a karyotype from Canada that was identical to some in Siberia.