### Identification The Spotted Porcelain Crab (*Neopetrolisthes maculatus*) is a jewel of the reef, reaching a modest size of about 2.5 cm. Its smooth, snow-white carapace is adorned with a striking mosaic of fine, reddish-maroon spots. Unlike "true" crabs, it possesses only three pairs of visible walking legs and a pair of disproportionately large, flattened, paddle-like claws (chelae). To distinguish it from the nearly identical *N. oshimai*, look closely at the pattern: *N. maculatus* features smaller, more numerous spots that extend across its entire body, whereas *N. oshimai* typically has larger spots and more stark white space.
### Habitat & Range Widely distributed across the tropical Indo-Pacific—from the shores of East Africa to the Great Barrier Reef—this species is an obligate commensal of large sea anemones. You will almost exclusively find them nestled among the stinging tentacles of Carpet Anemones (*Stichodactyla*) or Bubble-tip Anemones (*Entacmaea quadricolor*) in shallow coral reef environments.
### Behaviour Observing these crabs is a lesson in rhythmic grace. They are usually found in male-female pairs, fiercely defending their host anemone from other crabs. While they are protected by the anemone's stinging cells, they don’t just sit still; they perform a constant, balletic "dance," swaying to avoid being pinched by their host while remaining tucked safely within its folds.
### Diet These are not hunters, but sophisticated "fishermen." They use specialized, feathery mouthparts called maxillipeds, which they cast into the current like miniature casting nets. They rhythmically sweep these fans through the water to trap passing plankton and organic detritus, which they then "lick" clean.
### Fascinating Fact Despite their name, these aren't "true" crabs—they are more closely related to squat lobsters! They earned the name "Porcelain" because of their extreme fragility; if a predator grabs them, they can instantly drop a limb (autotomy) to escape, much like a lizard dropping its tail. The discarded claw often continues to twitch, distracting the predator while the crab scuttles to safety.