👉 Eurystomatellidae are a family of small, simple gastropod mollusks that belong to the order Eustrophorinae, commonly known as the jellyfishes. They are characterized by their small size and spherical bodies, which is why they're often referred to as "euro-". These creatures are found in various habitats, including waterways, rivers, and even seawalls. Their shells are usually composed of a hard, tough outer layer that protects them