| Amastigos Piltz, 1977 |
| Amastigos acutus Piltz, 1977 |
| Amastigos delicatus López, Capa, Aguado & Cladera, 2005 |
| Anotomastus Hartman, 1947 |
| Anotomastus gordiodes (Moore, 1909) |
| Capitella de Blainville, 1828 |
| Capitella aciculatus (Hartman, 1959) |
| Capitella capitata (Fabricius, 1780) |
| Capitella capitata subsp. floridana Hartman, 1959 |
| Capitella caribaeorum Warren & George, 1986 |
| Capitella filiformis Claparède, 1864 |
| Capitella floridana Hartman, 1959 |
| Capitella giardi (Mesnil, 1897) |
| Capitella jonesi (Hartman, 1959) |
| Capitella ovincola Hartman, 1947 |
| Capitella teres Treadwell, 1939 |
| Capitellidae Grube, 1862 |
| Capitellides Mesnil, 1897 |
| Capitellides giardi Mesnil, 1897 |
| Capitellides jonesi Hartman, 1959 |