Porcelain crab at the Similan Islands.

At the Similan Islands, the porcelain crab is one of the reef’s most charming and hidden creatures. These tiny crabs are often found tucked under rocks or nestled among sea anemones, especially at popular dive sites like West of Eden. Despite their large claws, they aren’t aggressive — they use their fan-like arms to catch plankton drifting in the water.


Named for their fragile, porcelain-like shells, these crabs can shed a limb to escape predators and regrow it later. Their patterned bodies help them blend in perfectly with their surroundings, making them a favorite among macro photographers and keen-eyed divers.

You’ll often find porcelain crabs sharing homes with clownfish, creating a fascinating underwater scene. Although they’re small, spotting one feels like discovering a hidden treasure. So, while exploring the reefs of the Similan Islands, take a closer look — these delicate little filter feeders are easy to miss but always a joy to find.