Panarthropoda is a proposed clade that includes three major groups: arthropods, onychophorans (velvet worms), and tardigrades (water bears). These organisms share certain developmental and genetic traits, suggesting a close evolutionary relationship. They are characterized by segmented bodies and jointed appendages, which allow for diverse movement and adaptation to various environments. The members of Panarthropoda are found in a wide range of habitats, from deep oceans to forest floors. Arthropods, such as insects and crustaceans, are the most diverse and numerous, while tardigrades are known for their resilience, surviving extreme conditions. Onychophorans bridge the gap between these two groups, showcasing unique features that highlight their evolutionary significance.