Benthic Macroinvertebrates are animals that lack a backbone and are generally visible to the naked eye. They live in the lower areas of streams, under rocks. They include larval forms of many common insects such as Dragonflies, Damselflies, and Craneflies.

More information on benthic Macroinvertebrates can be found on the following page: http://www.epa.gov/bioindicators/html/invertebrate.html