中生代溪蛉类昆虫化石表现出显著的种类多样性和形态多样性，但是溪蛉类昆虫各类群分类地位以及系统发育关系仍然存在较大问题和争议。 本项目基于前期的积累，立足于我国丰富的中生代化石资源，对中生代溪蛉类昆虫化石进行全面系统的研究：1）查明我国中生代溪蛉类昆虫的种类多样性，澄清溪蛉类昆虫目前混乱的分类关系，建立系统可靠的溪蛉类昆虫化石分类鉴定体系；2）首次开展溪蛉类昆虫化石形态功能学研究，结合现生类群特性，探讨其与同时期植物、环境间存在的相互作用关系，寻找该时期溪蛉多样性分化的原因和机制；3）结合现生和化石，在属级水平上重建包涵了现生和古生的完整的溪蛉类昆虫系统树，确定各类群间系统发育关系，并在系统发育的框架下，结合形态学分析及历史地理分布，推断溪蛉类昆虫关键形态特征的演化规律，阐明溪蛉类昆虫分布格局成因，重建溪蛉类昆虫历史演化。

Osmylid-like lacewings show conspicuous species and morphological diversity in Mesozoic Era, however taxonomic status and phylogenetic relationships within the group are still a longstanding debate. This project conducts a comprehensive study of the Mesozoic osmlid-like lacewings, based on the previous research and the abundant resource of the Mesozoic insect fossil in China. It would be focused on the following scopes: 1) Investigate the species diversity of the Mesozoic osmylid-like lacewings, clarify the ambiguous taxonomic interrelationships within the group, and establish the credible classification system of osmylid-like fossil; 2) Study the morphological function of the osmylid-like lacewings under the consideration of the features of the extant groups, explore the potential interraltionships between osmylid-like lacewings and plants, and infer the possible diversification mechanisms of osmylid-like families; 3) Reconstruct the phylogenetic relationships of osmyli-like lacewings at the generic level incorporating the fossil and extant, and under the phylogenetic framework, combining the morphological analysis and the historical distributed pattern, try to explain the evolutionary rules of the key characters and the reason of the distributed pattern, infer the possible historical dispersal route, and reconstruct the historical evolution of osmylid-like lacewings.