I do not know of anything like what you are looking for, especially as this site is international in it’s scope, the massive diversity amongst the insects of the world, and the very small size of so many of them makes this impossible. While many experts can identify insects to order and in some groups family or even genus by site, even for group specific experts, keys, often involving genital dissection, are an essential tool of the trade. For larger species such as Orthoptera and Odonata it is often possible to learn the fauna of a local area well enough to ID most specimens to species level, this is not possible for groups like Diptera, Hymenoptera and Coleptera. For example, in my biodiversity studies of a national park in Greece I could record most species of Odonata on sight, but I needed microscope examination to separate several closely related species.

Is there a simplified taxonomy guide that narrows down insects to a species using a few clearly distinct characteristic such wing venation/color, antennae style/segment, dorsal claw, etc.? I found that there is usually 2-3 very distinct visual clues that narrow it down to a species without microscopic examination or chemical analysis.

Any suggestions?