Notiosorex cockrumi, R. J. Baker, O'Neill & McAliley, 2003

Russell A. Mittermeier & Don E. Wilson, 2018, Soricidae, Handbook of the Mammals of the World – Volume 8 Insectivores, Sloths and Colugos, Barcelona: Lynx Edicions, pp. 332-551 : 448-449

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).

Figures

136. Elliot’s Short-tailed Shrew (Blarina hulophaga), 137. Northern Short-tailed Shrew (Blarina brevicaudus), 138. Southern Short-tailed Shrew (Blarina carolinensis), 139. Everglades Short-tailed Shrew (Blarina peninsulae), 140. Sherman’s Short-tailed Shrew (Blarina shermani), 141. Sichuan Short-tailed Shrew (Blarinella quadraticauda), 142. Burmese Short-tailed Shrew (Blarinella wardi), 143. Indochinese Short-tailed Shrew (Blarinella griselda), 144. Chinese Mole Shrew (Anourosorex squamaipes), 145. Taiwanese Mole Shrew (Anowrosorex yamashinai), 146. Assam Mole Shrew (Anowrosorex assamensis), 147. Giant Mole Shrew (Anourosorex schmid), 148. Desert Gray Shrew (Notiosorex crawfordi), 149. Cockrum’s Gray Shrew (Notiosorex cockrumi), 150. Large-eared Gray Shrew (Notiosorex evolis), 151. Villa’s Gray Shrew (Notiosorex villa), 152. Mexican Shrew (Megasorex gigas), 153. Taiwanese Brown-toothed (Shrew Epusoriculusfumidus), 154. Arboreal Brown-toothed Shrew (Episoriculus macrurus), 155. Bailey's Brown-toothed Shrew (Episoriculus baileyi), 156. Long-tailed Brown-toothed Shrew (Episoriculus leucops), 157. Hodgson’s Brown-toothed Shrew (Episoriculus caudatus), 158. Sichuan Brown-toothed Shrew (Episoriculus sacratus), 159. Hidden Brown-toothed Shrew (Episoriculus umbrinus), 160. Nepalese Brown-toothed Shrew (Episoriculus soluensis), 161. Himalayan Shrew (Soriculus nigrescens), 162. De Winton’s Brown-toothed Shrew (Chodsigoa hypsibia), 163. Pygmy Brown-toothed Shrew (Chodsigoa parva), 164. Smith’s Brown-toothed Shrew (Chodsigoa smithii), 165. Salenski’s Brown-toothed Shrew (Chodsigoa salenskii), 166. Dusky Brown-toothed Shrew (Chodsigoa furva), 167. Lesser Taiwanese Brown-toothed Shrew (Chodsigoa sodalis), 168. Van Sung’s Brown-toothed Shrew (Chodsigoa caovansunga), 169. Hoffmann’s Brown-toothed Shrew (Chodsigoa hoffmanni), 170. Lowe’s Brown-toothed Shrew (Chodsigoa parca), 171. Bornean Water Shrew (Chimarrogale phaeura), 172. Sumatran Water Shrew (Chimarrogale sumatrana), 173. Malayan Water Shrew (Chimarrogale hantu), 174. Chinese Water Shrew (Chimarrogale styani), 175. Himalayan Water Shrew (Chimarrogale himalayica), 176. Leander’s Water Shrew (Chimarrogale leander), 177. Japanese Water Shrew (Chimarrogale platycephala), 178. Elegant Water Shrew (Nectogale elegans), 179. Mediterranean Water Shrew (Neomys anomalus), 180. Transcaucasian Water (Shrew Neomysteres), 181. Eurasian Water Shrew (Neomys fodiens)

Distribution. SE Arizona (SW USA) S to C Sonora (NW Mexico).