Diastylis is a genus of crustaceans which belong to the family Diastylidae. It includes the following species: * Gladfelter, 1975 * G. O. Sars, 1871 * Jones, 1960 * Calman, 1912 * Zimmer, 1908 * Le Loeuff & Intes, 1972 * Zimmer, 1907 * Sars, 1873 * Petrescu & Bacescu, 1991 * Calman, 1912 * Calman, 1912 * Diastylis bidentata Calman, 1912 * (Stimpson, 1853) * Zimmer, 1930 * Norman, 1879 * Bacescu & Petrescu, 1991 * Donath-Hernandez, 1988 * Zimmer, 1936 * Hale, 1937 * Blake, 1929 * (Boeck, 1864) * Watling & McCann, 1996 * Calman, 1912 * Jones, 1969 * Jones, 1956 * Fage, 1928 * Fage, 1940 * Bate, 1865 * (Krøyer, 1841) * Ledoyer, 1993 * Jones, 1969 * Sars, 1873 * Ledoyer, 1993 * (Nicolet, 1849) * Bacescu & Petrescu, 1991 * J