Order Rodentia - Family Sciuridae 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 2 754 818 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Spermophilus undulatus (Pallas 1778) [Spermophilus] undulatus (Pallas 1778) , Nova Spec. Quad. Glir. Ord.: 122 . Type Locality: "Selenga River valley," [Buryat ASSR , Russia ]. Vernacular Names: Long-tailed Ground Squirrel . Subspecies: : Subspecies Spermophilus undulatus subsp. undulatus Pallas 1778 Subspecies Spermophilus undulatus subsp. altaica Brandt 1841 Subspecies Spermophilus undulatus subsp. jacutensis Brandt 1844 Subspecies Spermophilus undulatus subsp. menzbieri Ognev 1937 Subspecies Spermophilus undulatus subsp. stramineus Obolenskii 1927 Subspecies Spermophilus undulatus subsp. transbaikalicus Obolenskii 1927 Distribution: E Kazakhstan ; S Siberia, Transbaikalia ( Russia ); N Mongolia ; Heilungjiang and Xinjiang ( China ). Conservation: IUCN – Lower Risk (lc). Discussion: Subgenus Urocitellus according to Gromov et al. (1965:162) , but see Hall (1981:381) who included Urocitellus in subgenus Spermophilus . Formerly included parryii ( Hall and Kelson, 1959:343 ) ; but see Nadler et al. (1974) and comments under parryii . Chromosomes described by Nadler et al. (1975 a ) .