Newtoniellidae is a family of minute sea snails, marine gastropod mollusks or micromollusks in the superfamily Triphoroidea.It contains the following subfamilies : * Adelacerithiinae * Adelacerithium Ludbrook, 1941 * Ataxocerithiinae * Ataxocerithium Tate, 1894 * Eumetulinae * Cerithiopsida Bartsch, 1911 * Embrionalia Golikov, 1988 * Eumetula Thiele, 1912 * Furukawaia Kuroda & Habe in Habe, 1961 * Marshallaskeya Gründel, 1980 * Laeocochlidinae * Laeocochlis Dunker & Metzger, 1875 * Sasamocochlis Gründel, 1980 * Newtoniellinae * Cerithiella Verrill, 1882 * Granulotriforis Kosuge, 1967 * Paramendax A. W. B. Powell, 1937 * Trituba Jousseaume, 1884Genera brought into synonymy * Altispecula Powell, 1930: synonym of Eumetula (Altispecula) Powell, 1930 repre