The cylindrical bark beetles (Colydiidae) are small to medium-sized beetles, which are often found under bark, in decaying wood and in the bore holes of other beetle species. Adults and larvae of many species are predators of wood-boring insects, others feed on rotten wood or on fungi. Worldwide, 1500 species have been described, in Germany 20 species have been recorded. Several of the species are considered as "urwaldrelikt species" and are threatened with extinction.