[tagh]

That is, if you haven't already squished it!

Speaking as an Australian, common spiders which aren't poisonous (e.g., daddy long-legs, huntsmen, little jumpy-guys) is general knowledge. As is the really bad ones (funnel webs, redbacks). If you're bitten by something else, you generally assume it's somewhat poisonous and pay close attention to how you're feeling.

This kind of approach would have more impact for snakes, whose venom can vary significantly -- although hanging around to snap a picture seems dangerous. Perhaps a suggestion system based on salient features?

[lgats]

Now we just need to classify squished spiders.