Type species: Hippothoa irregularis Gabb & Horn, 1860
This genus includes the species:
| Canu & Bassler, 1935 | Paleogene Oligocene | Australia Victoria. | WoRMS 1399580 | |
| Canu & Bassler, 1929 | Recent | Philippines | WoRMS 472049 | |
| (Wood, 1844) | Neogene Pliocene | England | WoRMS 1409858 | |
| (Gabb & Horn, 1860) | Paleogene Paleocene Thanetian | USA New Jersey | WoRMS 1409859 | |
| (Harmelin, 1973) | Recent | Mediterranean | WoRMS 882557 | |
| Voigt, 1930 | Late Cretaceous Maastrichtian | Germany | WoRMS 1399581 | |
| (Canu & Bassler, 1920) | Neogene Miocene Aquitanian | USA Alabama | WoRMS 1409860 | |
| Lang, 1914 | Paleogene Paleocene Danian | NW Europe | WoRMS 1399582 | |
| Brown, 1952 | Paleogene Oligocene | New Zealand. | WoRMS 1399583 |