| Sigaretus sanctijohannis Pilsbry & Lowe, 1932 |
| Sigatica Meyer & Aldrich, 1886 |
| Sigatica carolinensis (Dall, 1889) |
| Sigatica semisulcata (Gray, 1839) |
| Sininae Woodring, 1928 |
| Sinum Röding, 1798 |
| Sinum (Sinum) Röding, 1798 |
| Sinum (Sinum) grayi (Deshayes, 1843) |
| Sinum (Sinum) sanctijohannis (Pilsbry & Lowe, 1932) |
| Sinum debile (Gould, 1853) |
| Sinum maculatum (Say, 1831) |
| Sinum minus (Dall, 1889) |
| Sinum noyesii Dall, 1903 |
| Sinum perspectivum (Say, 1831) |
| Stigmaulax Mörch, 1852 |
| Stigmaulax broderipiana (Récluz, 1844) |
| Stigmaulax cancellatus (Hermann, 1781) |
| Stigmaulax cayennensis Récluz, 1850 |
| Stigmaulax sulcatus (Born, 1778) |
| Tectonatica Sacco, 1890 |