【目的】 使用几何形态学方法分析水虻科痩腹水虻亚科指突水虻属Ptecticus 7种水虻翅的形态，以期为其鉴定提供新方法。【方法】 应用标点法对7种指突水虻的翅进行量化分析，每张翅照片选取28个地标点，采用主成分分析（Principal component analysis，PCA）、聚类分析（Cluster analysis）和典型变量分析（Canonical variate analysis，CVA）探究翅脉的形态变异。【结果】 7种指突水虻在翅脉形态上存在显著差异（P<0.05），变异部位主要在亚前缘脉（Sc）和径脉分支（R₁-R₅）的端部。主成分分析和聚类分析显示福建指突水虻Ptecticus fukienensis、狡猾指突水虻P. vulpianus和斯里兰卡指突水虻P. srilankai相较其他几种水虻而言，翅形差异较小。典型变量分析能够将7种指突水虻区分开来，分类效果理想。【结论】 证明了几何形态学方法在水虻分类中应用的可行性，28地标点的典型变量分析能够实现指突水虻属7种昆虫的分类，为进一步研究奠定了基础。

[Aim]  Geometric morphometric analysis was carried out on the wings of seven species of Ptecticus, to provide a new species identification method. [Methods]  Quantitative analysis of seven species of Ptecticus was carried out using the landmarks method. A total of 28 landmarks were selected from each wing photo. Principal component analysis, cluster analysis, and canonical variable analysis was used to explore the morphological variation of the wing veins. [Results]  There were significant differences in the morphology of the wings, primarily located at the ends of subcosta and radial vein. Principal component analysis and cluster analysis showed relatively small differences in wing shape between P. fukienensis, P. vulpianus, and P. srilankai compared with other species. Canonical variable analysis was able to distinguish between the seven species, and the classification effect was optimal. [Conclusion] This article demonstrates the feasibility of applying geometric morphology methods for the classification of Stratiomyidae. Canonical variable analysis of 28 landmarks was able to classify seven species of Ptecticus. The findings of this study establish a foundation for further research into the use of geometric morphometrics for species identification.