Sorex jacksoni Hall & Gilmore 1932

• Main Authors: Russell A. Mittermeier, Don E. Wilson
• Format: Other/Unknown Material
• Language: unknown
• Published: Lynx Edicions 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Mammalia; Soricomorpha; Soricidae; Sorex; Sorex jacksoni; Bering Sea; North Cape; St Lawrence Island; Tundra; Alaska
• Online Access: https://doi.org/10.5281/zenodo.6869738; http://treatment.plazi.org/id/3D474A54A032875EFFF5AAFE16D9F79A

71. Saint Lawrence Island Shrew Sorex jacksoni French: Musaraigne de Saint Lawrence / German: St. Lawrence-Rotzahnspitzmaus / Spanish: Musarana de San Lorenzo Other common names: Saint Lawrence Shrew Taxonomy. Sorex jacksoni Hall & Gilmore, 1932, “ Sevoonga, 2 miles [= 3- 2 km] east of North Cape, St. Lawrence Island, Bering Sea, Alaska,” USA. Sorexjacksoni is in the S. cinereus group and subgenus Otisorex. It is included in the Beringian clade with S. pribilofensis, S. portenkoi, S. ugyunak, S. camtschaticus, and S. leucogaster, all six species might represent one wide-ranging species based on genetic information, but they are retained here. Sorex jacksoni previously included S. portenkoi, S. ugyunak, and S. leucogaster, although they have been variously placed as distinct species and conspecifics. There is little genetic distance among all species in the Beringian clade, and there are no significant differences between karyotypes of S. jacksoni and mainland S. cinereus, although genetic studies show that the Beringian clade is notsister to S. cinereus butis closest to S. lyelli, S. haydeni, and S. preblei. Because of conflicting genetic, morphological, and karyological studies, all six species of the Beringian clade are considered distinct until additional research is conducted. Monotypic. Distribution. St. Lawrence I, off W Alaska (USA). Descriptive notes. Head-body 62-71 mm, tail 32-37 mm, hindfoot 12-14 mm; weight 4-5 g. The Saint Lawrence Island Shrew is medium-sized. Dorsum is very dark brown, and sides and venter are whitish, with brownish hue. Tail is relatively short, narrow, and distinctly bicolored, being pale brown above and whitish below. Teeth are dark red. There are five unicuspids,fifth is minute, and first through fourth get slightly smaller from front to back. Chromosomal complement has 2n = 66 and FN = 70. Habitat. Moist maritime tundra, including boggy areas, fell-field habitats, and mesic tundra habitats. Food and Feeding. No information. Breeding. No information. Activity patterns. No ...