Where has the Square-tailed Worm been recorded?

Eiseniella tetraedra occurrence evidence comes from 4,890 records in 23 countries and territories, from 1913 to 2026. Most records come from Germany.

• 4,890 records
• 23 places
• 60 years recorded
• Clitellata class

Observation evidence passport

Compare this animal’s observation pattern

When it is recorded

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

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

Where Square-tailed Worm has been recorded

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