Evidence found
3,456 records across 17 countries and territories, 1927–2024.
Acartia tonsa · GBIF taxon key 2114446
Where has the Acartia tonsa been recorded?
Acartia tonsa occurrence evidence comes from 3,456 records in 17 countries and territories, from 1927 to 2024. Most records come from Sweden.
- 3,456 records
- 17 places
- 42 years recorded
- Copepoda class
Observation evidence passport
Source coverage
CC0 GBIF Animalia occurrence facets, including country, month and year summaries.
Refreshed 2026-09-21. Inspect the taxon on GBIF.
What this means
The species has been recorded in the listed places in the stated source universe. Peak month: April.
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: April. 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
19272024
Recording effort has risen steeply almost everywhere since the 1990s, so a rising line usually shows more observers rather than more animals.
Where Acartia tonsa has been recorded
The countries below show where occurrence evidence exists for Acartia tonsa. 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 |
|---|---|---|
| Sweden | 1,235 | |
| Germany | 757 | |
| Denmark | 583 | |
| United States | 523 | |
| Canada | 134 | |
| Latvia | 112 | |
| Ukraine | 82 | |
| Finland | 12 | |
| Georgia | 7 | |
| Australia | 3 | |
| Netherlands | 2 | |
| Åland Islands | 1 | |
| Chile | 1 | |
| Spain | 1 | |
| Falkland Islands | 1 | |
| Mexico | 1 | |
| Saudi Arabia | 1 |
Related animals
Others in the family Acartiidae.
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.