Tylidae is a family of woodlice. It contains 23 species, all but one in the genus Tylos, the other being Helleria brevicornis. Together with the family Ligiidae, Tylidae appears to have diverged early from the remaining woodlouse families.
12Schotte M, Boyko CB, Bruce NL, Poore GC, Taiti S, Wilson GD, eds. (2026). "Tylidae Dana, 1852". World Marine, Freshwater and Terrestrial Isopod Crustaceans Database. World Register of Marine Species. Retrieved 20 September 2026.