Soricidae Author Russell A. Mittermeier Author Don E. Wilson text 2018 2018-07-31 Lynx Edicions Barcelona Handbook of the Mammals of the World – Volume 8 Insectivores, Sloths and Colugos 332 551 book chapter http://doi.org/10.5281/zenodo.6870843 978-84-16728-08-4 6870843 149. Cockrum’s Gray Shrew Notiosorex cockrumi French: Musaraigne de Cockrum / German: Cockrum-Wistenspitzmaus / Spanish: Musarana gris de Cockrum Other common names: Cockrum'’s Desert Shrew , Cockrum'’s Shrew Taxonomy. Notiosorex cockrumi R. J. Baker, O’Neill & McAliley, 2003 , “ Arizona , Cochise County , Leslie Canyon National Wildlife Refuge , T21S , R28E Section NE 4 20 , Elevation 4460 [m] .” Restricted by L. N. Carraway in 2007 to “latitude 31-60°N , longitude 109-53°W .” Notiosorex cockrumi seems to be closest to N. crawfordi . It has primarily been distinguished from N. crawfordi by genetic data, and exact distribution of both species is currently unknown. Monotypic. Distribution. SE Arizona (SW USA) S to C Sonora (NW Mexico). Descriptive notes. Head-body 52-61 mm, tail 19-27 mm, ear 7-9 mm, hindfoot 9-11 mm; weight 3-6-3 g. Cockrum’s Gray Shrew is small and externally nearly identical to the Desert Gray Shrew (N. crawfordi ) and other species of Notiosorex exceptit has shorter middle foreclaw and differentiating cranial characteristics. Dorsum is light grayish, and venter is white or pale gray. Feet are broad, with relatively short claws. Tail is ¢.33% of head-body length, unicolored pale gray, and covered in very short hairs. Ears are long and conspicuous, being same color as dorsal pelage externally and pinkish internally; eyes are small but large compared with other shrews; and snout is pink with dark line on ridge extending to tip of rostrum. Females have three inguinal mammae. Unlike the Large-eared Gray Shrew (N. evotis ), Cockrum’s Gray Shrew has an extension of roof of glenoid fossa that forms prominent ridge on lateral side of cranium. Cockrum’s Gray Shrew is intermediate in size between the Desert Gray Shrew and the Large-eared Gray Shrew. It can be distinguished from the Desert Gray Shrew and Villa’s Gray Shrew (N. villai ) byits total length and from the Large-eared Gray Shrew and Villa’s Gray Shrew by condylo-basal length (15:8-16-5 mm), breadth across M*-M?* (4:6—4-9 mm), and length of 1,-M, (4:6—4-8 mm). It can also be separated from the Large-eared Shrew by its cranial breadth (8-2-9 mm), coronoid process height (4-4-3 mm), and articular condyle height (2:7-3 mm). There are three unicuspids, and teeth are entirely white with no pigmentation,as in all species of Notiosorex . Dental formula for all species of Notiosorexis13/2,C1/0,P1/1,M 3/3 = 28. Habitat. Desert shrub habitats dominated by mesquite, agave, cholla, and oak brush at elevations of 677-1195 m. Food and Feeding. No information. Breeding. No information. Activity patterns. No information. Movements, Home range and Social organization. No information. Status and Conservation. Classified as Least Concern on The IUCN Red List. Cockrum’s Gray Shrew is very poorly known but has a relatively wide distribution with no major threats. Additional studies are needed on this rather cryptic species. Bibliography. Baker et al. (2003), Carraway (2007, 2014c), Carraway & Timm (2000), McAliley et al. (2007), Timm et al. (2017).