Evidence found
194 records across 28 countries and territories, 1883–2026.
Echinothrix diadema · GBIF taxon key 5188164
Where has the blue-black urchin been recorded?
Echinothrix diadema occurrence evidence comes from 194 records in 28 countries and territories, from 1883 to 2026. Most records come from Marshall Islands.
- 194 records
- 28 places
- 46 years recorded
- Echinoidea class
Observation evidence passport
Source coverage
CC0 GBIF Animalia occurrence facets, including country, month and year summaries.
Refreshed 2026-08-23. Inspect the taxon on GBIF.
What this means
The species has been recorded in the listed places in the stated source universe. Peak month: May.
9 months reach at least 10% of the peak facet count.
What this does not mean
repeated describes the record pattern, not a formal range, residency, abundance or conservation assessment.
A single record remains evidence of a recording, not proof that a population lives there.
Compare this animal’s observation pattern
When it is recorded
JFMAMJJASOND
Peak month: May. 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
18832026
Recording effort has risen steeply almost everywhere since the 1990s, so a rising line usually shows more observers rather than more animals.
Where blue-black urchin has been recorded
The countries below show where occurrence evidence exists for blue-black urchin. They do not define a complete habitat range: survey effort differs by place, and historical or one-off records can appear alongside repeated presence.
| Place | Records | Share |
|---|---|---|
| Marshall Islands | 54 | |
| United States | 52 | |
| Kiribati | 13 | |
| Philippines | 9 | |
| Costa Rica | 8 | |
| French Polynesia | 8 | |
| Guam | 7 | |
| Papua New Guinea | 5 | |
| Seychelles | 5 | |
| South Africa | 5 | |
| Maldives | 4 | |
| Micronesia | 3 | |
| American Samoa | 2 | |
| Cook Islands | 2 | |
| New Caledonia | 2 | |
| United States Minor Outlying Islands | 2 | |
| Samoa | 2 | |
| Australia | 1 | |
| Indonesia | 1 | |
| British Indian Ocean Territory | 1 | |
| Japan | 1 | |
| Kenya | 1 | |
| Sri Lanka | 1 | |
| Nauru | 1 | |
| Palau | 1 | |
| Tonga | 1 | |
| Taiwan | 1 | |
| Tanzania | 1 |
Related animals
Others in the family Diadematidae.
Record pattern: repeated
Repeated records across many years and months. 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.
Repeated records across many years and months. 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.