Macroinvertebrates are animals without a backbone that can be seen with the naked eye. These bottom-dwelling animals include crustaceans and worms but most are aquatic insects. Beetles, caddisflies, stoneflies, mayflies, hellgrammites, dragonflies, true flies, and some moths are among the groups of insects represented in streams. Macroinvertebrates are an important link in the food web between the producers (leaves, algae) and higher consumers such as fish.
Need to identify an aquatic macroinvertebrate you found in a stream? Use our macroinvertebrate identification key.
Click on photos to enlarge. All photos by David H. Funk.
Data pages for each Schuylkill Project sampling site list the 10 most abundant macroinvertebrate taxa found at that site. Clicking on a macroinvertebrate name in the data table will bring up a pop-up window showing with a photo. This gallery has been provided so that all 54 taxa identified for the project can be viewed in the same page.