Abstract
This review summarizes the available data on multilevel differentiation in the araneus species group of the genus Sorex (Eulipotyphla, Mammalia). Communication 1 gives basic information about the biology and morphological and karyotypic differentiation of some species belonging to this genus, as well as about the subdivision of one of the species, the common shrew (Sorex araneus), into intraspecific chromosomal races. The list of the 75 races known so far is included (26 of them dwell in Russia).
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