What types of bugs live in caves?

A range of terrestrial and aquatic invertebrates use caves for shelter, and some are adapted to live underground for their full lives.

I'm not sure what you class as "bugs" because the Word is American & I'm not, soI don't know if it is limited to beetles, but you can find some species of beetles in caves.Nor do I know American cave invertebrates though I imagine they are not far different from those in the UK.

The other little animals include (in UK caves at least) a tiny insect called a "fungus gnat", springtails, a few moth species (part-time),certain Spiders,and, in the water, freshwater shrimps and various mites.