Type species: Brachysoecia convexa Canu & Bassler, 1922
This genus includes the species:
| Viskova, 1968 | Paleogene Paleocene Danian | Ukraine Crimea | WoRMS 1400377 | |
| Viskova, 1968 | Paleogene Paleocene Danian | Ukraine Crimea | WoRMS 1400378 | |
| Canu & Bassler, 1922 | Late Cretaceous Cenomanian | France | WoRMS 1400379 | |
| Viskova, 1968 | Paleogene Paleocene Danian | Ukraine Crimea | WoRMS 1400380 |