| Eisigella ouanaryensi Gravier, 1901 |
| Eunotomastus McIntosh, 1885 |
| Eunotomastus gordiodes Moore, 1909 |
| Heteromastides Augener, 1914 |
| Heteromastides bifidus Augener, 1914 |
| Heteromastus Eisig, 1887 |
| Heteromastus filiformis (Claparède, 1864) |
| Leiocapitella Hartman, 1947 |
| Leiocapitella glabra Hartman, 1947 |
| Leiochrides Augener, 1914 |
| Leiochrides hemipodus Hartman, 1960 |
| Mastobranchus Eisig, 1887 |
| Mastobranchus variabilis Ewing, 1984 |
| Mediomastus Hartman, 1944 |
| Mediomastus ambiseta (Hartman, 1947) |
| Mediomastus californiensis Hartman, 1944 |
| Mediomastus cirripes Ben-Eliahu, 1976 |
| Mediomastus fragilis Rasmussen, 1973 |
| Mediomastus glabrus Hartman, 1960 |
| Mediomastus setosus Hartmann-Schröder, 1959 |