中国蒙镖水蚤属新记录种湄公蒙镖水蚤及其分子系统学研究  

FIRST RECORD OF MONGOLODIAPTOMUS MEKONGENSIS IN CHINA AND ITS PHYLOGENETIC ANALYSIS

作　　者：魏朝军[1] 熊丹妮 王雨路 冯伟松[1] 缪荣丽[1] 龚迎春[1] WEI Chao-Jun;XIONG Dan-Ni;WANG Yu-Lu;FENG Wei-Song;MIAO Rong-Li;GONG Ying-Chun(Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China;Center for Ecological and Environmental Monitoring and Scientific Research,Yangtze River Basin Ecological and Environmental Supervision Administration,Ministry of Ecology and Environment,Wuhan 430010,China)

机构地区：[1]中国科学院水生生物研究所,武汉430072 [2]生态环境部长江流域生态环境监督管理局生态环境监测与科学研究中心,武汉430014

出　　处：《水生生物学报》2023年第10期1640-1648,共9页Acta Hydrobiologica Sinica

基　　金：生物多样性调查评估项目(2019HJ2096001006)资助。

摘　　要：蒙镖水蚤属(Mongolodiaptomus)隶属于桡足亚纲(Copepoda)哲水蚤目(Calanoida)镖水蚤科(Diaptomidae),目前国内记录蒙镖水蚤属5种,研究记录了采自海南的蒙镖水蚤属新记录种湄公蒙镖水蚤(Mongolodiaptomus mekongensis Sanoamuang&Watiroyram, 2018)。借助光学显微镜和扫描电镜等方法对该种进行形态描述,获取该物种的18S rDNA基因序列并探讨了其系统发育地位。该种雌性成体的主要特征:第5胸节右后侧角比左后侧角稍大;生殖节前部的左侧隆起,顶部具一锐刺;右侧具三角形片状突起,长度超过生殖节中部,顶部亦具一刺;第5胸足内肢二节。该种雄性成体主要形态特征:执握肢倒数第3节外末角具一梳状突起;第5右胸足基节内末角有一刺状突起,外肢第2节中部侧刺明显扭曲;右尾叉前端近中部有一个三角状刺状突起,末端有一个半圆状突起。分子系统发育分析显示该种与镖水蚤科真镖水蚤属(Eudiaptomus)、新镖水蚤属(Neodiaptomus)具有较近的亲缘关系。Diaptomidae is one of the most common seen freshwater copepod fauna,the taxonomic study of this taxon is the basic information for the theoretical study of systemic zoology.Five species of genus Mongolodiaptomus(Copepoda,Calanoida,Diaptomidae)were reported in China before.This research reported a new species of Mongolodiaptomus from Hainan Island,which is the first record of Mongolodiaptomus mekongensis Sanoamuang&Watiroyram,2018 in China.Through scanning electronic and light microscopy,the morphological characteristics are described and illustrated in detail.In addition,18S rDNA gene sequences were also obtained for the first time to investigate phylogenetic position of this species.Morphological characteristics of female species are described in detail as follows:posterolateral wings of the fifth pedigerous segment were asymmetrical and right wing somewhat was larger than left.Left proximal part of genital somite broadly expanded and provided with laterally directed spine;Right proximal region of genital somite produced into posterolaterally directed,triangular process,tipped with variablespine,exceeded the middle of the genital somite.Morphological characteristics of male species are described in detail as follows:Right antennule transformed and geniculated,with 22 segments and the antepenultimate with comb-like process;Intercoxal plate of the right fifth leg produced into spine-like lobes on distal margin;The principal lateral spine on second exopodite of the right fifth leg is obviously bent;The right caudal ramus has two ventral chitinous prominences,one strong spiniform process on prominence proximally and one semi-circular ridges located at the end.The molecular phyloge netic analysis showed that M.mekongensis is closed related with the genus Eudiaptomus and Neodiaptomus.This study provides detailed morphological characteristics and molecular data for M.mekongensis,laying the foundation for future research on this species and genus Mongolodiaptomus.

关 键 词：新记录种 淡水桡足类 18S rDNA 湄公蒙镖水蚤 

分 类 号：Q145[生物学—生态学]