The earliest cave-dwelling animal identified from the dinosaur era is a ghostly white cockroach with tiny eyes and wings that was preserved in amber
Source:
https://www.newscientist.com/article/2234805-earliest-known-cave-dwelling-animal-is-a-99-million-year-old-cockroach/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home