| 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 fragilis Rasmussen, 1973 |
| Mediomastus glabrus Hartman, 1960 |
| Mediomastus setosus Hartmann-Schröder, 1959 |
| Neomediomastus Hartman, 1969 |
| Neomediomastus glabrus (Hartman, 1960) |
| Neonotomastus Fauchald, 1972 |
| Neonotomastus glabrus Fauchald, 1972 |
| Neopseudocapitella Rullier & Amoureux, 1979 |
| Neopseudocapitella brasiliensis Rullier & Amoureux, 1979 |