Aquatic arthropods are a diverse group of invertebrates that live in water. They belong to the phylum Arthropoda, which includes animals with jointed legs and exoskeletons. Common examples of aquatic arthropods are crustaceans like crabs, lobsters, and shrimp, as well as copepods and barnacles. These creatures play essential roles in aquatic ecosystems, serving as both predators and prey. Aquatic arthropods have adapted to life in water with specialized features. Many possess gills for breathing underwater, while others have developed unique body shapes for swimming. They are found in various habitats, including oceans, rivers, and lakes, contributing to the biodiversity of these environments.