Common Net-spinner Caddisflies
These photos supplement pages 119-135 of the Guide to Aquatic Invertebrates of the Upper Midwest. Information on the biology of Hydropsychidae can be found on page 128. Hydropsychidae do not make cases. All three of their thoracic segments have sclerotized dorsal plates. Hydropsychidae have branched gills on the ventral side of their abdomen and a brush of hairs at the end of their abdomen.