Historical assessments missing from the API
Source: IUCN API, with species and taxonomy from the CSV export · 3 rows
The table below lists assessments that the IUCN API says exist but cannot return. Each taxon record on the API includes a list of that taxon's assessments, current and historical. Every assessment id listed below appears in one of those lists, but a direct request to /api/v4/assessment/{id} returns HTTP 404 (not found).
Every affected id is a historical (superseded) assessment; each taxon's current assessment loads normally. Because the API returns no data for these records, the species name and taxonomy in the table below are taken from the offline CSV export on iucnredlist.org, matched on the taxon's SIS id.
Why it matters
Anyone retrieving a taxon's assessment history through the API will request these ids and get 404 errors, even though the taxon's own record lists them as assessments that exist.
Suggestion
Either restore the assessment record so the id can be requested, or remove the id from the taxon's assessment list so the two agree.
By HTTP status
"Current assessments" counts the rows that are the taxon's current (latest) assessment; the rest are historical.
| HTTP status | Current assessments | All rows |
|---|---|---|
| 404 | 0 | 3 |
Preview
| Scientific name | Authority | Class | Order | Family | Assessed as | Assessed scope | Failed assessment | HTTP status | Current | Year | Attempts | SIS id | Red List (fails) | Detail | Last error | Root SIS id |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pettancylus clessinianus | (Jickeli, 1882) | GASTROPODA | HYGROPHILA | PLANORBIDAE | DD | Global & Pan-Africa | 4783813 | 404 | no | 2011 | 2 | 155476 | view | Listed in the taxon's assessments, but a direct request for this assessment id returns HTTP 404 (not found). | IUCN API request to /api/v4/assessment/4783813 failed with status 404 on attempt 1 Body: {"error":"Assessment ID 4783813 not found"} | 155476 |
| Trinectes paulistanus | (Miranda Ribeiro, 1915) | ACTINOPTERYGII | PLEURONECTIFORMES | ACHIRIDAE | LC | Global | 86378350 | 404 | no | 2019 | 2 | 193274 | view | Listed in the taxon's assessments, but a direct request for this assessment id returns HTTP 404 (not found). | IUCN API request to /api/v4/assessment/86378350 failed with status 404 on attempt 1 Body: {"error":"Assessment ID 86378350 not found"} | 193274 |
| Ziphius cavirostris | G. Cuvier, 1823 | MAMMALIA | ARTIODACTYLA | ZIPHIIDAE | LC | Global | 2785108 | 404 | no | 2012 | 2 | 23211 | view | Listed in the taxon's assessments, but a direct request for this assessment id returns HTTP 404 (not found). | IUCN API request to /api/v4/assessment/2785108 failed with status 404 on attempt 1 Body: {"error":"Assessment ID 2785108 not found"} | 23211 |
Changes since 2025-2
Blank-scope assessments, which the API previously answered with an HTTP 500 Error, were planned to be listed on this page also, however the API now serves them, so they have moved to Assessments with no geographic scope.