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Crustacean

Thin-shelled rock crab

Grapsus tenuicrustatus

Wave-splashed rocky shores

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Thin-shelled rock crab

Photo: (c) Harrison Cole, some rights reserved (CC BY) · CC-BY · Source and license. Displayed as a resized crop. Photograph illustrates the species.

Habitat
Wave-splashed rocky shores
Habitat zone
Intertidal rocks and the splash zone
Viewing activities
Beach / tidepool

What to look for

A shore crab also known as ʻaʻama in Hawaiʻi; the field account gives a shell width of about 2 inches.

Wider distribution

Hawaiʻi and the wider Indo-Pacific.

When to look

The available records do not establish a reliable local viewing season. Use the map’s month filter to inspect dated observations; it does not predict an encounter.

WHERE HAS IT BEEN RECORDED?

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These dated records show past presence. They do not establish today’s abundance, guarantee a sighting, or describe the species’ entire range.