Sorex (Otisorex) jacksoni Hall and Gilmore 1932

Sorex (Otisorex) jacksoni Hall and Gilmore 1932, Univ. California Publ. Zool., 38: 392.

Type Locality: USA, "Sevoonga, 2 miles [3.2 km] east of North Cape, St. Lawrence Island, Bering Sea, Alaska." .

Vernacular Names: St. Lawrence Island Shrew.

Distribution: Known only from St. Lawrence Isl (Bering Sea).

Conservation: IUCN – Endangered.

Discussion: Subgenus Otisorex; S. cinereus group (Demboski and Cook, 2003). Placed in the arcticus species group by Hall and Gilmore (1932) and in the cinereus species group by Hoffmann and Peterson (1967). Separated from cinereus by Junge and Hoffmann (1981). Van Zyll de Jong (1982) included leucogaster (= beringianus), portenkoi, and ugyunak in this species, but van Zyll de Jong (1991 b) retained all three as distinct. Rausch and Rausch (1995) included jacksoni as a subspecies in S. cinereus based on identical karyotypes (2n = 66, FN = 70), but Demboski and Cook (2003) found a nonsister relationship between S. cinereus and S. jacksoni in their genetic analysis of the group.