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宁陕异鳞蛇（蛇目，异盾盲蛇科）的分类修订及来自中国西部一新亚种的描述

Taxonomic Revision of Ningshan Odd-Scaled Snake, (Serpentes, Xenodermidae), with Description of a New Subspecies from Western China.

作者信息

Xu Yuhao, Ma Shun, Cai Bo, Yang Diancheng, Zhang Tianyou, Gu Tianxuan, Zhu Fengcheng, Huang Song, Peng Lifang

机构信息

State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China.

School of Ecological and Environmental Engineering, Qinghai University, Xining 810016, China.

出版信息

Animals (Basel). 2024 Nov 27;14(23):3425. doi: 10.3390/ani14233425.

DOI:10.3390/ani14233425
PMID:39682390
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11639932/
Abstract

(Yang, Huang, Jiang, Burbrink, and Huang, 2022) was first described in Ningshan County, Shaanxi Province, China in 2022, based on seven female specimens. In this study, based on phylogenetic analyses using mitochondrial 12S ribosomal RNA (), 16S ribosomal RNA (), cytochrome c oxidase subunit 1 (), cytochrome b (cyt ) gene fragments, and morphological examinations of specimens, we revise the taxonomic status of , and provide additional data on this species. The molecular phylogeny indicated that is nested in a highly supported monophyletic group, forming a sister taxon to , and is divided into two well-supported lineages, A and B, with an uncorrected -distance between lineages from 3.6 to 4.3% for . Therefore, we proposed that Lineage B from western Sichuan and southwestern Shaanxi is a new subspecies, ssp. nov., and Lineage A from southern Shaanxi and northeastern Sichuan is allocated as . Morphologically, the new subspecies can be distinguished from its congeners, especially from , by the following characteristics: (1) the tail is relatively short, with a TAL/TL ratio of 0.202-0.226 in males, and 0.155-0.178 in females; (2) there are two pairs of chin-shields; (3) there are 21-22 maxillary teeth; (4) the length of the suture between internasals is significantly shorter than that between prefrontals, with an LSBI/LSBP ratio of 0.502-0.773; (5) there are six supralabials, with the fourth and fifth in contact with the eye; (6) there are five to six infralabials, and the first to third or fourth touches the first pair of chin-shields; (7) there is one hexagonal loreal, with an LorH/LorL ratio of 0.612-1.040; (8) the two anterior temporals are in contact with the eye; (9) there are 155-160 ventrals in males, and 165-174 in females; (10) there are 60-65 subcaudals in males, and 49-53 in females, which are not paired; and (11) the dorsum is iridescent and uniformly charcoal black, lacks a longitudinal vertebral line, and has a dark brown or dark gray ventral area.

摘要

（杨、黄、江、布尔布林克和黄，2022）于2022年首次在中国陕西省宁陕县被描述，基于七个雌性标本。在本研究中，基于使用线粒体12S核糖体RNA（）、16S核糖体RNA（）、细胞色素c氧化酶亚基1（）、细胞色素b（cyt）基因片段的系统发育分析以及标本的形态学检查，我们修订了的分类地位，并提供了关于该物种的更多数据。分子系统发育表明，嵌套在一个得到高度支持的单系类群中，形成了的姐妹分类单元，并分为两个得到充分支持的谱系A和B，谱系之间的未校正距离对于为3.6%至4.3%。因此，我们提出来自四川西部和陕西西南部的谱系B是一个新亚种，新亚种，而来自陕西南部和四川东北部的谱系A被指定为。在形态上，新亚种可以通过以下特征与其同属物种，特别是与区分开来：（1）尾巴相对较短，雄性的TAL/TL比率为0.202 - 0.226，雌性为0.155 - 0.178；（2）有两对颏片；（3）有21 - 22颗上颌齿；（4）鼻间缝的长度明显短于额前缝，LSBI/LSBP比率为0.502 - 0.773；（5）有六个上唇鳞，第四和第五个与眼接触；（6）有五到六个下唇鳞，第一个到第三个或第四个接触第一对颏片；（7）有一个六边形的眶下鳞，LorH/LorL比率为0.612 - 1.040；（8）两个前颞鳞与眼接触；（9）雄性有155 - 160枚腹鳞，雌性有165 - 174枚；（10）雄性有60 - 65枚尾下鳞，雌性有49 - 53枚，且不成对；（11）背部有虹彩且均匀为炭黑色，没有纵向的脊椎线，腹部区域为深棕色或深灰色。

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