👉 Hydatina is a genus of freshwater snailfishes. They belong to the family Hydriidae and are found in various parts of the world, including Asia, Africa, and North America. These creatures have a variety of shapes and sizes, from small, round-bodied species to large, elongated ones. The eggs laid by these snails can be up to 15 inches long, making them one of the longest-lived freshwater snailfishes known to science. Hy