BugGuide

This site from Iowa State University is a citizen science initiative dedicated to gathering data on arthropods of all kinds. Arthropods comprise the most species-rich phylum of animals—everything from crustaceans, to spiders, insects, and centipedes. The catalog of images in this database is browsable within the taxonomic hierarchy, which can be helpful for narrowing down the identity of an unknown “bug” to the order or family level, if not always to the exact species. Don’t forget to check the ‘Info’ tab as you browse; it offers a more detailed description of whichever group or species is selected in the Guide.