Knowra Hermit crab Hermit crab A decapod crustacean whose soft, asymmetrical abdomen is usually protected inside an empty gastropod shell. Its dependence on portable shelter shapes its anatomy, behavior, and social interactions.
Gastropod shell : A hard external covering secreted by a gastropod mollusk, often retained after the animal dies. The shell shelters the crab’s vulnerable abdomen and must be replaced as it grows.
Decapoda : An order of crustaceans characterized by five pairs of thoracic walking legs. Hermit crabs are decapods, though their bodies differ sharply from typical shrimp and crabs.
Shell limitation : A shortage of suitable empty shells relative to the needs of shell-dwelling animals. Limited shelter can constrain hermit crab growth, survival, and reproduction.
Dardanus calidus : A large Mediterranean hermit crab that commonly carries sea anemones on its shell. Its partnerships with anemones illustrate conspicuous defense through carried shelter.
Abdomen : The posterior body region of an arthropod, behind the cephalothorax. Its soft, twisted abdomen fits the curved interior of a gastropod shell.
Anomura : A group of decapod crustaceans including hermit crabs, squat lobsters, and porcelain crabs. Their ancestry lies among anomurans, not the true crabs of Brachyura.
Shell resource partitioning : The division of a shared resource among species through differing preferences or use. Different hermit crab species often favor distinct shell types or sizes.
Clibanarius vittatus : A striped hermit crab found in shallow coastal waters of the western Atlantic. Its use of varied gastropod shells makes it a familiar intertidal example.
Cheliped : A claw-bearing appendage of a crustacean, formed from a modified walking leg. Hermit crabs use their claws to block shell openings and handle food.
Crustacean : An arthropod in the diverse group that includes crabs, lobsters, and shrimp. The hermit crab’s jointed limbs and molting exoskeleton are crustacean traits.
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