中国重庆发现猪尾鼠属（啮齿目：刺山鼠科）一新种

Ying-Ting Pu; Tao Wan; Rong-Hui Fan; Chang-Kun Fu; Ke-Yi Tang; Xue-Long Jiang; Bao-Wei Zhang; Ting-Li Hu; Shun-De Chen; Shao-Ying Liu

doi:10.24272/j.issn.2095-8137.2021.338

中国重庆发现猪尾鼠属（啮齿目：刺山鼠科）一新种

doi: 10.24272/j.issn.2095-8137.2021.338

1.
四川师范大学生命科学学院, 四川成都 610101, 中国
2.
中国科学院昆明动物研究所, 云南昆明 650204, 中国
3.
安徽大学生命科学学院, 安徽合肥 230601, 中国
4.
四川省林业科学研究院, 四川成都 610081, 中国

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出版历程
- 收稿日期: 2022-02-28
- 录用日期: 2022-04-02
- 网络出版日期: 2022-04-14
- 刊出日期: 2022-05-18

A new species of the genus Typhlomys Milne-Edwards, 1877 (Rodentia: Platacanthomyidae) from Chongqing, China

1.
College of Life Sciences, Sichuan Normal University, Chengdu, Sichuan 610101, China
2.
Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650204, China
3.
School of Life Science, Anhui University, Hefei, Anhui 230601, China
4.
Sichuan Academy of Forestry, Chengdu, Sichuan 610081, China

Funds: This work was supported by the National Natural Science Foundation of China (31970399, 32070424, 32001223)

More Information

Corresponding author: E-mail: csd111@126.com; Shaoyliu@163.com

摘要

摘要: 结合形态及分子分类学方法，依据采自重庆奉节的10号标本描述了猪尾鼠属（啮齿目：刺山鼠科）一新物种——白帝猪尾鼠（Typhlomys fengjiensis sp. nov. ）。分子分析结果显示新种为属内一单独的支系，是大娄山猪尾鼠（T. daloushanensis）的姐妹种，与属内其他物种间存在较大的遗传差异（遗传距离在0.122至0.215之间）。形态上，新种与其姐妹种最为相似，但仍能从以下特征进行区分：（1）新种的体型及头骨更大；（2）具有深度向内弯折的颧弓；（3）上第一臼齿具有开放的中沟，在唇侧和舌侧均开口使其贯穿整个齿面，而大娄山猪尾鼠上第一臼齿中沟为半封闭状态，仅在唇侧开口。新种的发现提示中国南部地区猪尾鼠属的物种多样性可能仍被低估。

Abstract: A new species of the genus Typhlomys Milne-Edwards, 1877 (Rodentia: Platacanthomyidae) is described based on 10 specimens collected from Chongqing in southwestern China using integrated taxonomy. Phylogenetic analysis showed that these specimens formed a distinct sister clade to T. daloushanensis Wang and Li, 1996, and differed from all six known Typhlomys species based on Kimura-2-parameter genetic distances of the cytochrome b (cyt b) gene (ranging from 0.122 to 0.215). The new species Typhlomys fengjiensis sp. nov. is most similar to T. daloushanensis in morphology. However, it differs from the latter by the following morphological characters: (1) larger body and skull; (2) deeper incurved zygomatic arch; and (3) mesofossette on first upper molar open on both buccal and lingual sides (vs. inner edge of endoloph closed in T. daloushanensis). The discovery of this new species supports that Typhlomys diversity remains underestimated in southern China.

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Figure 1. Sample localities, principal component (PCA) and discriminant function analysis (DFA), phylogenetic tree, divergence times, species delimitation and species tree of Typhlomys, with skull and molar comparisons of Typhlomys sp. 1 and T. daloushanensis, and dorsal, ventral, and lateral views of Typhlomys sp. 1

A: Sample localities of Typhlomys. B: PCA. C: DFA. D: Molar comparisons of T. daloushanensis and Typhlomys sp. 1 (a); Skull comparisons of T. daloushanensis (1: SCNU00554) and Typhlomys sp. 1 (2: SCNU02616, 3: SCNU02580) (b), and dorsal, ventral, and lateral of Typhlomys sp. 1 (Typhlomys fengjiensis sp. nov. (SCNU02616)) (c). E: Bayesian phylogenetic trees reconstructed with MrBayes v3.1.2, and derived from concatenated mitochondrial genes (a), GHR (b), IRBP (c), and concatenated nuclear and mitochondrial sequences (d) (node numbers are posterior probabilities). F: Divergence time estimates using BEAST v1.7.4 based on all five genes (node numbers are median ages of divergence times (upper) and posterior probabilities (lower)). G: Species delimitation using Bayesian Phylogenetics and Phylogeography (a) and Automatic Barcode Gap Discovery (b). H: Species tree reconstructed with *BEAST based on five genes (node numbers are posterior probabilities).

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