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University of Michigan Museum of Zoology: http://animaldiversity.ummz.umich.edu/site/index.html

The American Entomological Society:http://www.ansp.org/hosted/aes

Aquatic Insects of Michigan (University of Michigan): http://insects.ummz.lsa.umich.edu/~ethanbr/aim/sp/Diptera/sp_dom_references.html

Hudson Basin River Watch:http://www.hudsonbasin.org/

Bug Guide (Iowa State University Entomology): http://bugguide.net/node/view/52/tree

US EPA http://www.epa.gov/bioindicators/html/invertebrate.html

John Epler's Water Beetles of Florida Site: http://www.home.comcast.net/%7Ejohnepler3/index.html

Diptera of Pennsylvania: http://iz.carnegiemnh.org/cranefly/

Interagency Taxonomic Information System: http://www.itis.gov/taxmatch_ftp.html

North American Benthological Society: http://www.benthos.org

Pennsylvania Aquatic Flies (Penn State University): http://paaquaticfliesrus.bd.psu.edu

University of Arizona College of Agriculture and Life Sciences: http://tolweb.org/tree/phylogeny.html

Plecoptera Society of North America: http://plsa.inhs.uiuc.edu/plecoptera/default.aspx

Valley City State University Macroinvertebrate Lab:http://www.waterbugkey.vcsu.edu

Entomological Society of PA: http://www.entsocpa.org