A barnacle is a type of crustacean that is related to lobsters and crabs. There are over 1,220 species of barnacles that have been discovered and classified. Charles Darwin was the first person to officially study and classify them. In 1851 and 1854 he published a series of monographs.
Lobsters live on rocky, sandy, or muddy bottoms from the shoreline to beyond the edge of the continental shelf. They generally live singly in crevices or in burrows under rocks. They are invertebrates and have a tough protective exoskeleton. Like most arthropods, lobsters must molt in order to grow, leaving them vulnerable during this time. . Lobster skin in the stomachs of lobsters has been found before, although this is because lobsters will eat their shed skin after molting.
Crabs make some of the best tasteing seafood that you can get at a restaurant. But what was the poor animal before you ate it? Crabs are crustaceans that have very short ’tails’, though they may not look like tails. The tail is located where the reduced abdomen is entirely hidden under the thorax. They are generally covered with a thick exoskeleton, and are armed with a single pair of claws. Crabs are found in all of the world’s oceans; there are also many freshwater and terrestrial crabs, particularly in tropical regions. Crabs vary in size from the pea crab, only a few millimetres wide, to the Japanese spider crab, with a leg span of up to 4 m.
Shrimp are swimming decapod crustaceans that are classified in the infraorder Caridea. They are found mainly all over the world in both fresh and salt water. Shrimp are commonly caught and farmed for food. There are many unrelated crustaceans that have the word shrimp in their name. Crustaceans such as the mantis shrimp, and the mysid shrimp, but they belong in the Notostraca group.