鼩鼹亚科(Talpidae:Uropsilinae)一新种

A new species of Uropsilus(Talpidae:Uropsilinae)from Sichuan, China

2006年至2009年,在四川西南地区开展小型兽类区系调查时,在普格县、美姑县、泸定县、九龙县采获了11号鼩鼹类标本。其外形和头骨形态与其他鼩鼹类一致,但牙齿数量和齿式与已知鼩鼹类不同。这批标本上、下颌牙齿均为9枚,齿式为i2/2,c1/1,pm3/3,m3/3=36,与少齿鼩鼹上颌9枚、下颌8枚(齿式:i2/1,c1/1,pm3/3,m3/3=34)不同,也不同于长吻鼩鼹与贡山鼩鼹(齿式:i2/1,c1/1,pm4/4,m3/3=38)及峨眉鼩鼹(齿式:i2/2,c1/1,pm4/3,m3/3=38)上颌10枚、下颌9枚,而不能归类于现有任何已知鼩鼹类物种。通过线粒体细胞色素b基因构建的系统发育关系显示未归类标本形成一单系群,且与峨眉鼩鼹关系最近,构成姊妹关系。为此,我们认为采自于四川普格县、美姑县、泸定县、九龙县的鼩鼹类标本为鼩鼹亚科一新物种。根据新种上、下颌牙齿数量相等命名为等齿鼩鼹(Uropsilus aequodonenia)。

We collected a group of shrew moles from Puge County, Meigu County, Luding County, and Jiulong County, southwestern Sichuan, China. Morphologically, they were similar to other species of shrew moles in possessing the follow- ing suite of characteristics ： body shrew-like ; snout long and thin ; ear present; forefeet small and not modified for digging; long tail has rings of small scales ; tip of tail with a tuft of hair appearing like a penbrush ; fur long and pointing posteriorly; and skull mole-like with complete zygomatic arches. However, the new specimens differed from all other species of shrew moles in two characteristics. First, the new specimens had nine teeth in both the upper and lower toothrows. In contrast, Uropsilus soricipes had nine teeth in the upper toothrow but eight in the lower toothrow; U. gracilis, U. andersoni, and U. investigator had 10 in the upper toothrow and nine in the lower toothrow. Second, the tooth formula differed in having i2/2, cl/1, pm3/3, and m3/3 = 36. This differed from U. soricipes, which had i2/1, el/1, pm3/3, and m3/3 = 34. It also differed from U. andersoni： i2/2, el/l, pm4/3, and m3/3 = 38. Uropsilus gracilus and U. investigator had i2/1, el/1, pm4/4, and m3/3 = 38. The upper toothrows of the new specimens were similar to U. soricipes. The lower toothrow was similar to U. andersoni in having two incisors with the second one being minute; U. gracilis and U. investigator had only one lower incisor. Reconstructions of the matrilineal history based on maximum likelihood, maximum parsimony, and Bayesian inference of mitochondrial cytochrome b sequences always resolved the new specimens as being the sister lineage to U. andersoni. Given the matrilineal history and differences in morphology, we described the new specimens as the species Uropsilus aequodonenia sp. nov. and suggested the English name ＇Equivalent teeth Shrew Mole＇.