• Schenella T. MacBrown, 1911
• Schnella Raddi, 1820
• Scionella Moore, 1903
• Siagonella Lecordier, 1977 accepted as Siagona Latreille, 1804
• Sichotenella Tumanskaya, 1953 †
• Sichuanella Lopatin, 2008 accepted as Meristata Strand, 1935
• Sicyonella Borradaile, 1910
• Silonella Fischer, 1966
• Simeonella Sohn, 1968 † accepted as Lutkevichinella Schneider, 1956 †
• Simonella Peckham, 1885 accepted as Synemosyna Hentz, 1831
• Simponella Haas, 1914 (unaccepted)
• Siphlonella Needham & Murphy, 1924
• Siphonella (A. Gray) Heller, 1912 accepted as Linanthus Bentham, 1833 [Family: Polemoniaceae]
• Siphonella (Torrey & A. Gray) J.K. Small, 1903 accepted as Valerianella P. Miller, 1754 [Family: Caprifoliaceae]
• Siphonella Börner, 1939 (uncertain) [Family: Hemiptera (awaiting allocation)]
• Siphonella Hagenow in Geinitz, 1850 (unaccepted > nomen nudum) [Family: Bryozoa (awaiting allocation)]
• Siphonella Hagenow, 1851 (uncertain) [Family: Bryozoa (awaiting allocation)]
• Siphonella Issel, 1869 accepted as Montfortista Iredale, 1929 [Family: Fissurellidae]
• Siphonella Lendenfeld, 1887 accepted as Siphonochalina Schmidt, 1868 [Family: Callyspongiidae]
• Siphonella Macquart, 1835 [Family: Chloropidae]
• Siphonella Verrill, 1879 † (uncertain) [Family: Mollusca (awaiting allocation)]
• Siphoniella Westblad, 1952 accepted as Synsiphonium Hallez, 1911
• Stichorella Koehler, 1920 accepted as Anasterias Perrier, 1875
• Stictonella Giebel, 1877 accepted as Stictonetta Reichenbach, 1852
• Suchonella Spizharsky, 1937 † (uncertain)
• Syconella Schmidt, 1868 accepted as Sycon Risso, 1827