Where has the Freshwater hydroid been recorded?

Cordylophora caspia occurrence evidence comes from 847 records in 17 countries and territories, from 1801 to 2025. Most records come from Sweden.

• 847 records
• 17 places
• 53 years recorded
• Hydrozoa class

Observation evidence passport

Compare this animal’s observation pattern

When it is recorded

Peak month: August. 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

Recording effort has risen steeply almost everywhere since the 1990s, so a rising line usually shows more observers rather than more animals.

Where Freshwater hydroid has been recorded

The countries below show where occurrence evidence exists for Freshwater hydroid. They do not define a complete habitat range: survey effort differs by place, and historical or one-off records can appear alongside repeated presence.