| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Leucosolenia echinata Kirk 1894 | 0 | 0 | 2 |
| Limneria H. Adams & A. Adams 1851 | 0 | 0 | 5 |
| Limoidea Rafinesque 1815 | 0 | 0 | 1 |
| Limopsoidea Dall 1895 | 0 | 0 | 1 |
| Lingulata Gorjansky & Popov 1985 | 0 | 0 | 1 |
| Lissoclinum Verrill 1871 | 0 | 0 | 2 |
| Littorinimorpha Golikov & Starobogatov 1975 | 0 | 0 | 1 |
| Lottioidea Gray 1840 | 0 | 0 | 1 |
| Lucinoidea J. Fleming 1828 | 0 | 0 | 1 |
| Lumbrineridae | 0 | 0 | 1 |
| Mactroidea Lamarck 1809 | 0 | 0 | 1 |
| Malacostraca Latreille 1802 (Malakostraka) | 0 | 0 | 1 |
| Marseniella Bergh 1886 | 0 | 0 | 5 |
| Marsenina Gray 1850 | 0 | 0 | 5 |
| Marseniopsis Bergh 1886 | 0 | 0 | 5 |
