In this short post, I’m going to be talking about this unknown or rare crab. I tried my best to find information about this animal. So just enjoy it.
These crabs really do resemble tiny pebbles and are sometimes seen on our Northern shores. Silty, sandy areas near seagrasses. They are usually buried under the sand.
Features: Body width 1-2cm. Body smooth somewhat rhomboid, indeed resembling a tiny pebble. The head forms a blunt pointed tip with a pair of tiny eyes. In this way, its eyes can peep out while the rest of the crab is buried underground. It has powerful long flat pincers with pointed claws. The crab can bury itself in the sand very rapidly. Some may be colourful.
The carapace of this crab is almost circular 20-25 mm wide, smooth, slaty grey with three slightly angular projections on each side. The legs are slender with chelipeds that are long and fine, especially in the male.
This species of pebble crab is commonly found among seagrass in shallow mud and sand flats across southern Australia such as in Port Phillip Bay, Western Port and Corner Inlet.
Pebble crabs can be seen burrowing in the soft mud of intertidal seagrass meadows but move about in search of food when the tide is out. They use their long chelipeds to capture small invertebrates.
Status and threats: Some of our pebble crabs are listed as ‘Endangered’ on the Red List of threatened animals of Singapore. Like other creatures of the intertidal zone, they are affected by human activities such as reclamation and pollution. Trampling by careless visitors also have an impact on local populations.