田螺科是一类大型的卵胎生淡水腹足类软体动物，广泛分布在除南美洲之外的世界各地。中国是田螺科物种多样性最高的地区，已记录的种类达11属83种。传统上田螺科的分类主要依据壳形态特征，但由于壳形态的高度可塑性，导致该科分类十分混乱，一些类群的系统位置、属种的有效性和边界划分存在较大争议。本研究拟在广泛采集田螺科标本的基础上，采用形态学、比较解剖学、微形态学和分子生物学相结合的方法，厘定一些争议属种，开展田螺科的分类研究。内容包括：1）壳形态变异及分类特征筛选；2）软体部分比较解剖及分类特征发掘；3）争议属/种的分子生物学鉴定；4）中国田螺科的分类整理及系统修订。通过综合分析，重新评价形态特征的分类学价值，筛选和发掘出不同阶元的分类特征，对我国田螺科进行全面的分类修订。研究结果不仅能全面推进该科的系统学研究，而且为其资源利用与物种多样性保护、寄生虫与入侵种防治以及生物地理学研究等提供知识支撑。

The Viviparidae Gray, 1847, a group of large-sized and ovoviviparous freshwater gastropods, is nearly cosmopolitan, but absent from South America, reaching their highest diversity in China with 11 genera and 83 species recorded. The traditional taxonomy of viviparids is primarily based on characters of shell morphology, such as shell shape, size and sculpture. But shell morphology exhibits a large amount of plasticity caused by environment variations, which results in a chaotic state of taxonomy of viviparid snails, systematic position, boundary delimitation and validities of many taxa and its phylogeny are still equivocal in studies using shell characters only. This problem is most pronounced in China with the highest number of viviparid species. In this study, we plan to carry out a field survey for viviparid specimens firstly, then delimit boundaries for controversial genus or species, and explore its taxonomic revision using shell morphology, anatomy of soft-part, micro-morphology and molecular systematics with mitochondrial (COI and 16S) and nuclear (H3, 18S and 28S) DNA. The contents of this study are as following: 1) Plasticity of shell morphology and sorting character for taxonomy; 2) Comparative anatomy of soft-part and exploring character for taxonomy; 3) Identification for controversial genera and species based on DNA sequence; 4) Taxonomic and systematic revision of Viviparidae based on morphological and molecular data. We want to reevaluate taxonomical value of triditional morphological characters, sort and explore some new important taxonomical characters, and then make an overall revision for viviparid taxonomy based on comprehensive analysis of morphological and molecular data. The results can not only promote its systematic studies and applications in China, but also provide knowledgical supports for conservation of biodiversity and sustainable utilization of biological resources, control of parasites and invasive species, and biogeography of the Viviparidae.