There are two major types of spider.
1. Live
2. Dead
Beyond that, without extremely distinctive markings (like an hourglass on the belly) or their webs, they usually need to be type 2 to positively identify them down to species level.
In my "bag 'em and tag 'em" biology course many of the spiders required close examination of eyes, legs and reproductive parts .
SWMBO tries to ensure any spider she sees is type 2.