腹足類 (ふくそくるい), or gastropods, are a large class of mollusks characterized by their distinct body structure, which typically includes a coiled shell and a muscular foot. They are found in various environments, including oceans, freshwater, and terrestrial habitats. This diverse group includes familiar creatures like snails and slugs. These organisms exhibit a wide range of sizes, shapes, and colors. Their unique adaptations allow them to thrive in different ecosystems, and they play essential roles in the food web. Some gastropods are herbivores, while others are carnivores or scavengers, contributing to nutrient cycling in their habitats.