| Reference no. | Description | year | Name used | Page |
|---|---|---|---|---|
| 104085 | Birkeland, C. and H. Manner 1989 Resource survey of Ngerukewid Islands Wildlife Preserve, Republic of Palau. A report to the government of Palau, the South Pacific Regional Environment Programme, World Wildlife Fund, and the International Union for the Conservation of Nature, 202p. | 1989 | Spondylus zonalis | --> |
| 3477 | MarineSpecies.org 2050 MarineSpecies.org. http://www.marinespecies.org/index.php | 2050 | Spondylus zonalis | --> |