| Petricolaria Stoliczka, 1870 |
| Petricolaria cognata (C. B. Adams, 1852) |
| Petricolaria pholadiformis (Lamarck, 1818) |
| Petricolinae d'Orbigny, 1840 |
| Pitar Römer, 1857 |
| Pitar (Hyphantosoma) Dall, 1902 |
| Pitar (Lamelliconcha) Dall, 1902 |
| Pitar (Lamelliconcha) callicomatus (Dall, 1902) |
| Pitar (Lamelliconcha) frizzelli Hertlein & Strong, 1948 |
| Pitar (Pitar) Römer, 1857 |
| Pitar (Pitar) albidus (Gmelin, 1791) |
| Pitar (Pitar) berryi Keen, 1971 |
| Pitar (Pitar) consanguineus (C. B. Adams, 1852) |
| Pitar (Pitar) fulminatus (Menke, 1828) |
| Pitar (Pitar) helenae Olsson, 1961 |
| Pitar (Pitar) perfragilis Pilsbry & Lowe, 1932 |
| Pitar (Pitar) simpsoni (Dall, 1895) |
| Pitar arestus (Dall & Simpson, 1901) |
| Pitar circinatus (Born, 1778) |
| Pitar cordatus Schwengel, 1951 |