| Reference no. | Description | year | Name used | Page |
|---|---|---|---|---|
| 132953 | Rubio, F. and E. Rolán 2022 New species of Vitrinellidae (Gastropoda: Truncatelloidea) from the Indo-Pacific. The genus Circulus Jeffreys, 1865. Museo de Historia Natural, Universidad Santiago de Compostela, 426p. | 2022 | Circulus simpliciter | 56-57;fig.A24 |
| 3477 | MarineSpecies.org 2050 MarineSpecies.org. http://www.marinespecies.org/index.php | 2050 | Circulus simpliciter | --> |