Best Calappidae

The Moon Crab is a marine crustacean inhabiting sandy coastal waters, recognized by its nearly circular, pale-colored shell and specialized paddle-like legs adapted for swimming.

The Flower Moon Crab is an Indo-Pacific marine crustacean distinguished by its beautifully patterned, sand-colored carapace and its specialized limbs used for rapidly digging into sand.

The Box Crab is a marine crustacean distinguished by its nearly perfectly circular, domed carapace that allows it to fold its claws tightly against its body for defense.

The Flap-jack Box Crab is a flat, heavily armored crustacean native to the Pacific coast of North America, named because its enormous carapace resembles a large pan-fried pancake.