关键词: 食虫目, 鼩鼱属, 扁颅鼩鼱, 新纪录

Abstract: In 2014 and 2015, two shrew specimens were trapped using pitfall traps in the Hengdaohezi region of the Changbai Mountains and the Huzhong region of the Great Khingan Mountains in Heilongjiang Province, China. Their morphological and skull indices were measured and compared to known specimens of Sorex roboratus. Body lengths were 66.52mm (H2) and 58.46mm (D36). Tail lengths were 40.33mm (H2) and 31.46mm (D36). Greatest lengths of skulls were 21.68 mm (H2) and 19.85 mm (D36). Basal lengths were 17.44 mm (H2) and15.64 mm (D36). The size of first maxillary and second maxillary were similar, and the second maxillary was larger than the third maxillary.  Based on morphological characteristics, the two new specimens were assigned to the species flat-skulled shrew, Sorex roboratus. To further confirm the species assignment, we sequenced their mitochondrial cytochrome b gene and constructed a phylogenetic tree by using the sequences of the specimens with cyt b sequences of Sorex species in GenBank. It was shown that our specimen lay in a monophyletic clade together with S. roboratus. The genetic distances between S. roboratus specimens recorded in GenBank and our specimen were between 0.003 and 0.009. The morphological and molecular genetic evidence above supported the assignment of the two specimens to the flat-skulled shrew, S. roboratus, suggesting a new record of the species in China．

Key words: Insectivora, Sorex, Sorex roboratus, Hollister, 1913, New record