Sorex roboratus Hollister 1913

• 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 roboratus; kolyma river; Siberia
• Online Access: https://doi.org/10.5281/zenodo.6869581; http://treatment.plazi.org/id/3D474A54A02C8740FFF6AA5C1163F3A1

7. Flat-skulled Shrew Sorex roboratus French: Musaraigne forte / German: Flachkopf-Rotzahnspitzmaus / Spanish: Musarana de craneo aplastado Taxonomy. Sorex roboratus Hollister, 1913, “Tapucha [Near Teletskoye Lake)], Altai Mountains, Siberia,” Russia. Sorex roboratus is a relict species. Sorex raddei, another relict species, is its closest relative based mtDNA. Because of their distinct placement within Sorex, both S. roboratus and S. raddei are included in the S. raddei group here. The caecutiens group is close by karyotype structure. Five subspecies recognized. Subspecies and Distribution. S.r.roboratusHollister,1913—Altai-Sayanregion. S.r.jakutensisDukelsky,1928—W&CSiberiaandSYakutia(=SakhaRepublic). S.r.platycraniusOgnev,1921—PrimorskyKrai(SRussianFarEast). S.r.thomasiOgnev,1921—TransbaikaliaandNMongolia. S. r. vir G. M. Allen, 1914 — NE part of range (Yana, Indigirka, and Kolyma river basins). Descriptive notes. Head-body 58-86 mm, tail 30-48 mm, hindfoot 12-15-5 mm; weight 7-15-5 g (immatures 7-10-5 g). Tail of the Flat-skulled Shrew is 40-60% of head-body length, and injuveniles,it is covered with relatively long hairs that form distinct tuft at tip. Long and rather narrow head is a key feature; braincase is substantially less elevated than in other species of Sorex. Pelage is bicolored; light gray color of belly does not extend to sides. Back varies from light brown to dark brown among different subspecies. Juveniles and overwintering individuals are only slightly different in color. Chromosomal complement has 2n = 42 and FN = 70, with 13 pairs of metacentric and submetacentric autosomes and seven pairs of acrocentric autosomes. X-chromosome is medium-sized subtelocentric, and Y-chromosome is small subtelocentric. Habitat. Various habitats in different regions. In the Altai-Sayan Mountains, the Flatskulled Shrew prefers dark coniferous forests and avoids xeromorphic and open habitats. In central Yeniseitaiga,it is uncommon in forests of Yenisei high floodplains and totally absent from watershed ...