Common name: banded porcelain crab

General information

The Green Porcelain Crab, scientifically known as Petrolisthes galathinus, is a small and colorful crustacean commonly found in the marine aquarium trade. Despite its common name, its coloration can range from green to brown or even purple, often with lighter spots or mottling. This species is known for its flat, rounded body and large front claws, which are actually more for show than for defense, as porcelain crabs are quite peaceful and prefer to avoid confrontation.

Care

Petrolisthes galathinus is a hardy species that adapts well to life in captivity. They require a tank with plenty of live rock and hiding places to feel secure. These crabs are filter feeders and will extend their feather-like appendages to capture food particles from the water column. Supplementing their diet with finely ground marine foods or plankton can ensure they receive adequate nutrition.

Reproduction

In the home aquarium, breeding Petrolisthes galathinus can be a challenge. These crabs are sexually dimorphic, meaning males and females have distinct physical differences. Successful breeding requires stable tank conditions and a well-established environment. The larvae are planktonic and require specialized care to survive to adulthood.

Symbiosis

One of the most interesting aspects of Petrolisthes galathinus is its symbiotic relationship with sea anemones. Similar to clownfish, porcelain crabs often seek refuge among the tentacles of anemones, gaining protection from predators. In return, the crab may help keep the anemone clean by removing detritus and leftover food.

Habitat

Green Porcelain Crabs are typically found in shallow reef environments, often associated with anemones or under rocks and coral rubble. They are widespread in the Indo-Pacific region, from the Red Sea and East Africa to the central Pacific.