Knowra Majoidea Majoidea Majoidea is a superfamily of decapod crustaceans that includes spider crabs and relatives. Many species have elongated legs and carapaces bearing spines, tubercles, or bristles.
Decapoda : An order of crustaceans with five pairs of thoracic legs, including crabs, lobsters, and shrimp. Majoidea is nested within this order of ten-legged crustaceans.
Crab : A decapod crustacean with a broad carapace, five pairs of legs, and a reduced abdomen folded underneath. Majoids are one distinctive branch of the broader crab body plan.
Marine ecology : The study of interactions among marine organisms and between organisms and ocean environments. Majoid crabs occupy varied marine habitats and interact with predators, prey, and substrates.
Dromiacea : A group of early-branching true crabs, many of which carry objects over their backs for concealment. Dromiaceans share unusual concealment behaviors but differ in lineage and typical body form.
Brachyura : The infraorder of true crabs, whose abdomen is folded beneath the cephalothorax. Majoidea belongs among the true crabs, rather than the other decapod groups.
Decapod locomotion : Movement in decapod crustaceans using jointed thoracic legs, with swimming or walking adapted to different habitats. Long walking legs account for the characteristic locomotion of many spider crabs.
Crab fishery : The harvesting and management of crabs for food and other commercial uses. Some majoid species are harvested, making their identification and population status relevant to fisheries.
Anomura : A decapod infraorder that includes hermit crabs, king crabs, and squat lobsters. Anomurans can resemble true crabs, but they belong to a separate infraorder.
Crustacea : A large subphylum of arthropods that includes crabs, lobsters, shrimp, and barnacles. This broader lineage supplies the arthropod framework for Majoidea.
Crab camouflage : Coloration, posture, and attached materials that help crabs blend into their surroundings. Many majoids use their hooked setae to attach algae or other cover.
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