中国陆生等足目整合分类学研究

陆生等足目是甲壳动物中定殖陆地生境最成功的类群，不仅在土壤生态系统中发挥着积极的作用，而且在环境监测和土壤污染降解等方面具有重要的贡献。在系统分类学研究中，该类群物种的鉴别性状主要来自雄性外生殖器，而雌性没有特化的外生殖器结构致使其鉴别性状难以确定。虽然DNA条形码促进了该类群物种的快速鉴定，但在界定分化时间短或存在基因渐渗等分类单元时，其无法准确反演系统发生关系、影响分类结果的准确性。本项目针对陆生等足目系统分类学研究中存在的诸多问题和我国该类群长期以来研究力量薄弱的现状，应用物种分布模型、形态分类学、几何形态度量学、DNA条形码和RAD-Seq技术对其进行整合分类学研究，解决雌性个体难以鉴别的形态分类学难题、探索应用多位点DNA数据界定疑难分类单元的高效途径、发现和记述新的和隐存的分类单元、揭示我国陆生等足目的物种多样性，为其在学术研究、环境指示和土壤污染修复等方面的应用提供科学依据。

Terrestrial Isopoda is the most successful taxon to colonize the terrestrial habitat in crustaceans. It is not only playing an important role in the soil ecosystem services but also making a significant contribution to environmental monitor and decomposition of soil pollution. In the taxonomic study, the species diagnostic characters are mainly based on the male external genitalia, but it is difficult to ensure the female diagnosis caused by the lacking of external genital structures. DNA barcoding is helpful to accelerate the species identity of this taxon. However, it is hard to reconstruct the precise phylogenetic relationships if the taxa concerned with incomplete lineage sorting and introgression etc., which affect the correction of taxonomic results. To resolve the many problems in the systematic research of terrestrial Isopoda and to improve the weak research situation in China, we plan to study this suborder in China by using an integrated approach that combined species distribution model, morphological taxonomy, Morphometrics, DNA barcoding and RAD-Seq technology. We aim at resolving the morphologically diagnostic problems in the female, exploring the effective way to delimit the ambiguous taxa by using multilocus DNA data, discovering and describing new and cryptic taxa, as well as revealing the species diversity of Chinese terrestrial isopods. The results will provide a scientific basis for the application of this taxon in the academic research, environmental monitor and soil pollution rehabilitation etc.