Infra-order Brachyura, Family Grapsidae, Subfamily Varuninae
Little white crab | Pseudograpsus albus Stimpson, 1858
A very small flat crab to 10 mm carapace width. Overall cream colour with light brown spots. Upper surface of carapace flattened and smooth.
Found under coral rocks on coral sand in relatively dry habitats as it is always found near supra littoral zone. It is well camouflaged and can be easily unnoticed without careful examination of the substrate.
Read more about Christmas Island's little white crab in the book
"Crabs of Christmas Island" by Max Orchard
Little white crab