This family consists of the following subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005):
Genera in the family Harpidae include:
- Genus † Asiaharpa Raven, 2021
- Harpinae
- Austroharpa Finlay, 1931
- † Eocithara P. Fischer, 1883
- Harpa Röding, 1798 - type genus of the family Harpidae
- Harpalis Link, 1807: synonym of Harpa Röding, 1798
- Palamharpa Iredale, 1931: synonym of Austroharpa Finlay, 1931
- † Cryptochordinae
- † Cryptochorda Mörch, 1858 - type genus of the subfamily Cryptochordinae
- Moruminae
- Morum Röding, 1798 - type genus of the subfamily Moruminae
- Cancellomorum Emerson & Old, 1963: synonym of Morum Röding, 1798
- Herculea H. Adams & A. Adams, 1858: synonym of Morum (Herculea) H. Adams & A. Adams, 1858 represented as Morum Röding, 1798
- Lambidium Link, 1807: synonym of Morum Röding, 1798
- Onimusiro Kuroda, Habe & Oyama, 1971: synonym of Morum Röding, 1798
- Oniscia G. B. Sowerby I, 1825: synonym of Morum Röding, 1798
- Oniscidia Mörch, 1852: synonym of Morum (Oniscidia) Mörch, 1852 represented as Morum Röding, 1798
- Pulchroniscia Garrard, 1961: synonym of Morum (Oniscidia) Mörch, 1852 represented as Morum Röding, 1798