Where has the Water hog lice been recorded?

Asellus aquaticus occurrence evidence comes from 15,062 records in 21 countries and territories, from 1884 to 2026. Most records come from Sweden.

• 15,062 records
• 21 places
• 73 years recorded
• Malacostraca class

Observation evidence passport

Compare this animal’s observation pattern

When it is recorded

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

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

Where Water hog lice has been recorded

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