Where does the blue-black urchin live?
Echinothrix diadema has 3,307 records in 54 countries and territories, from 1851 to 2026. Most records come from Cook Islands.
- 3,307 records
- 54 places
- 76 years recorded
- Echinoidea class
AnimaliaEchinodermataEchinoideaDiadematoidaDiadematidaeEchinothrix
When it is recorded
JFMAMJJASOND
Peak month: October. Records cluster in the months an animal is present and being looked for, so a summer peak can reflect observer effort as much as the animal.
Records over time
18512026
Recording effort has risen steeply almost everywhere since the 1990s, so a rising line usually shows more observers rather than more animals.
Where it is recorded
| Place | Records | Share |
|---|---|---|
| Cook Islands | 459 | |
| United States | 372 | |
| French Polynesia | 371 | |
| Kenya | 276 | |
| Wallis & Futuna | 189 | |
| Nauru | 182 | |
| Indonesia | 158 | |
| Solomon Islands | 150 | |
| Kiribati | 136 | |
| New Caledonia | 131 | |
| Papua New Guinea | 116 | |
| Marshall Islands | 94 | |
| Samoa | 74 | |
| Micronesia | 72 | |
| Australia | 57 | |
| Niue | 54 | |
| Palau | 52 | |
| Réunion | 46 | |
| Fiji | 33 | |
| Guam | 26 | |
| Tuvalu | 26 | |
| Philippines | 25 | |
| Tonga | 22 | |
| Egypt | 17 | |
| Taiwan | 16 | |
| Maldives | 14 | |
| Vanuatu | 14 | |
| Seychelles | 13 | |
| Christmas Island | 11 | |
| French Southern Territories | 10 | |
| South Africa | 9 | |
| Costa Rica | 8 | |
| ZZ | 7 | |
| American Samoa | 6 | |
| China | 6 | |
| Northern Mariana Islands | 6 | |
| United States Minor Outlying Islands | 6 | |
| Mayotte | 6 | |
| Mauritius | 5 | |
| Japan | 4 |
Showing the top 40 of 54 places.
Related animals
Others in the family Diadematidae.
Status from the records: resident
Recorded across many years and months — an established presence. This is inferred from how many years and months the animal appears in, not from a range map — treat it as evidence, not a formal assessment.
Recorded across many years and months — an established presence. This is inferred from how many years and months the animal appears in, not from a range map — treat it as evidence, not a formal assessment.