Dichotomous Key
Dichotomous keys make it easy to identify your critters by asking you simple questions
about the critter's morphology (shape) that lead you to the species name.
Thanks to the University of Virginia and the Save Our Streams Program of the
Izaak Walton League of America, this dichotomous key link is available for
you to use.
http://www.people.virginia.edu/~sos-iwla/Stream-Study/Key/Key1.HTML
The Stream Biomonitoring Unit of the New York State Department of Environmental
Conservation provides this online macroinvertebrate key with representative
photographs of major groups of aquatic macroinvertebrates. http://www.dec.state.ny.us/website/dow/stream/index.htm
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