They walk on land, especially if there is an obstruction to their migration. Most species are aquatic, living in either fresh or salt water habitats, but some have adapted to life on land. In Maine and parts of Canada, diners can find the so called peekytoe or bay crab, while the blue or softshell crab favors many parts of the East Coast, especially Maryland. One relatively easy to keep and yet often overlooked pet invertebrate type is the land crab, a type of crustacean that lives mainly on the edges of the water rather than in the seas and rivers themselves. While we may associate crabs most often with the sea, there are fresh water crabs and land crabs which live outside of the world's oceans. Rainbow Land Crabs, also known as Halloween Crabs and Moon Crabs, are about 8.0 inches in diameter when fully grown, making them the largest crab on the list. It is not only this type of adaptability which differentiates between different types of crab. Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, and armed with a single pair of chelae (claws). Because of their immense size, Rainbow Land Crabs require a tank of at least 30 gallons. Never being one to … Also known as Big Sluice Crab and the Shanghai Hairy Crab. They eat plants, small invertebrates, and detritus. Land crabs come in a variety of species from the tiny Ecuadorian Hermit Crab, which weighs less than an ounce, to the Coconut Crab which, at … Crustaceans include such familiar animals as crabs, crayfish, lobsters, shrimp, and barnacles. They occur in tropical America, West Africa, and the Indo-Pacific region.All species feed on both animal and plant tissue. Land crab, any crab of the family Gecarcinidae (order Decapoda of the class Crustacea), typically terrestrial, square-bodied crabs that only occasionally, as adults, return to the sea. Some have adapted certain abilities to spend time both on land and in water. The East coast of the United States has an abundant number of different types of crab. Living in freshwater and brackish water, Chinese Mitten Crabs burrow in banks and levees, but reproduce in salt water. Crabs are found in all of the world's oceans, while many crabs live in fresh water and on land, particularly in tropical regions. Many persons enjoy these tasty crustaceans while others abhor the crab-eating practice. Mangrove crabs live in swamps across Asia and Australia. While coconut crabs aren’t allowed in Hawaii today, a 2011 study published by the scientific journal Plos One shows that a different species of endemic land crabs -- Geograpsus severnsi -- once roamed the forested mountains there. Hunting land crabs is another ritualistic pastime we enjoy in Jamaica. One relatively easy to keep and yet often overlooked pet invertebrate type is the land crab, a type of crustacean that lives mainly on the edges of the water rather than in the seas and rivers themselves.