👉 Gonypetidae are a family of small, aquatic invertebrates that are found in freshwater and brackish water environments. They belong to the order Gonypetinae and include a group known as the Gonypetidae. These animals have a single, simple body with two pairs of arms, one at each end of the body. The bodies are usually covered in scales or bony plates that help them regulate their internal temperature and protect against predators.