Where has the Malletia johnsoni been recorded?

Malletia johnsoni occurrence evidence comes from 202 records in 10 countries and territories, from 1883 to 1986. Most records come from United States.

• 202 records
• 10 places
• 9 years recorded
• Bivalvia class

Observation evidence passport

Compare this animal’s observation pattern

When it is recorded

Peak month: November. 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 Malletia johnsoni has been recorded

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