In the caves there is a host of interesting underground animals such as crabs, mites, Nematodes, aquatic worms, spiders, pseudoscorpion, beetles and bats.
From the en.wikipedia.org
More examples
False scorpion: small nonvenomous arachnid resembling a tailless scorpion
(pseudoscorpions) tiny arachnids that have crab-like pinchers but no tail stinger and that feed on insects, mites, and other small invertebrate animals