| Reference no. | Description | year | Name used | Page |
|---|---|---|---|---|
| 109516 | Korn, W., Niederhöfer, H.-J., Blöcher, M. 2000 Conus pennaceus from Madagascar - a complex of geographical subspecies (Gastropoda: Conidae). Stuttgarter Beitr. Naturk. Ser, A 610:1-25. | 2000 | Conus echo | --> |
| 126039 | Paulay, G. 2022 Reproduction of Neogastropoda. Pers. Comm. via email [13/04/2022]. | 2022 | Conus echo | --> |
| 127697 |
IUCN 2022 The IUCN Red List of Threatened Species. Version 2022-1. |
2022 | Conus echo | --> |
| 130435 | IUCN 2025 The IUCN Red List of Threatened Species. 1964 - onwards. https://www.iucnredlist.org/ | 2025 | Conus echo | ver.2025-1 |
| 3477 | MarineSpecies.org 2050 MarineSpecies.org. http://www.marinespecies.org/index.php | 2050 | Conus echo | --> |