Aquatic Animals refer to a diverse group of organisms that live and thrive in water environments. This includes Actinopterygii, a class of ray-finned fishes; Arthropods, invertebrates with an exoskeleton, segmented body, and jointed appendages that can be found in marine ecosystems; Amphibians, which are cold-blooded vertebrates typically living both in water and on land; and other types of animals adapted to aquatic life.