Cryptoplax is a genus of polyplacophoran molluscs.The genus consists of the following living species: * E. A. Smith, 1884 * Rochebrune, 1882 * Leloup, 1937 * Ang, 1967 * Ashby, 1931 * Pilsbry, 1901 * Thiele, 1911 * Cryptoplax iredalei Ashby, 1923 * Pilsbry, 1901 * Burrow, 1815 * Iredale & Hull, 1925 * Quoy & Gaimard, 1835 * Ang, 1967 * Is. & Iw. Taki, 1930 * Iredale & Hull, 1925 * Cryptoplax striata Lamarck, 1819 * Thiele, 1909