The influence of environmental variables and the potential as bioindicators larval stages species Trichoptera were evaluated in a small stream northern Thailand from January to November 2017. A total 1,191 individual caddisfly larvae belonging 7 families 13 genus found. family Glossosomatidae most abundant, followed by Hydropsychidae Calamoceratidae. Glossosoma, Hydromanicusand Hydropsyche abun...