Iowa Crab is commonly known as the Mississippi River Crab, and it is a species of freshwater crab found in the Mississippi River Basin. The Iowa Crab has a hard exoskeleton, four pairs of legs, and two pincers that are used to catch prey and defend themselves against predators. Other synonyms for Iowa Crab include the Ohio River Crab, the Potamocarcinus Magna, and the Blue Crab. These crabs are an important food source for many animals, including humans. They can also be found in a variety of freshwater habitats, such as rivers, lakes, and streams. Iowa Crabs are mostly nocturnal and feed on small fish, insects, and other aquatic animals.