The crustaceans are a large group of arthropods, comprising roughly 52,000 d
escribed species, and are typically treated as a subphylum. They include various familiar animals, such as lobsters, crabs, shrimp, crayfish and barnacles. The majority are marine, living in either fresh water or marine environments, but a few groups have modified to earthly life, such as worldly crabs, terrestrial hermit crabs and woodlice. The majority are motile, moving about separately, although a few taxa are sponging and live attached to their hosts (including sea lice, fish lice, whale lice, tongue worms, and Cymothoa exigua, all of which may be referred to as "crustacean lice"), and adult barnacles live a sessile life — they are attached head-first to the substrate and cannot move autonomously.
The scientific study of crustaceans is known as carcinology. Other names for carcinology are malacostracology, crustaceology and crustalogy, and a scientist who works in carcinology is a carcinologist, crustaceologist or crustalogist.
escribed species, and are typically treated as a subphylum. They include various familiar animals, such as lobsters, crabs, shrimp, crayfish and barnacles. The majority are marine, living in either fresh water or marine environments, but a few groups have modified to earthly life, such as worldly crabs, terrestrial hermit crabs and woodlice. The majority are motile, moving about separately, although a few taxa are sponging and live attached to their hosts (including sea lice, fish lice, whale lice, tongue worms, and Cymothoa exigua, all of which may be referred to as "crustacean lice"), and adult barnacles live a sessile life — they are attached head-first to the substrate and cannot move autonomously.The scientific study of crustaceans is known as carcinology. Other names for carcinology are malacostracology, crustaceology and crustalogy, and a scientist who works in carcinology is a carcinologist, crustaceologist or crustalogist.
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