UTTAR PRADESH JOURNAL OF ZOOLOGY

In the present study, samples of Trichoptera (Caddisflies) were collected from two spring-fed streams, Khanda Gad (Pauri Garhwal) and Dhundprayag Gad (Tehri Garhwal), located in the Himalayas region of Uttarakhand. For the taxonomic assessment and morphological study, a detailed examination of morphological and meristic features of each collected individual was conducted using a microscope and a hand lens. Structural observations of the specimens were photographed, identified, and validated using a standard key. A pencil drawing of different parts of the head capsule, thoracic sclerites, Labrum, submetum, claws, and anal prolegs was produced, and differences were noted. Based on the differences and examination, a total of 15 species belonging to six families (Hydropsychidae, Philopotamidae, Psychomyiidae, Rhyacophilidae, Stenopsychidae, and Polycentropodidae) were collected and analysed, and it was found that the most dominant family was Hydropsychidae (198 individuals), followed by Philopotamidae (151) and Psychomyiidae (114). Less abundant families included Rhyacophilidae (29), Polycentropodidae (50), and Stenopsychidae (59). The study provides baseline data on freshwater Trichoptera, which serve as indicators of water quality and ecosystem health. It also contributes to the taxonomic knowledge of Himalayan aquatic insects and serves as a valuable reference for future biodiversity and conservation studies, emphasising the ecological importance of Trichoptera.