Mollusks are a large group of invertebrates that includes snails, clams, octopuses, and more, and researchers regularly add new species – both living and extinct. On Live Science, you can discover amazing mollusc facts and findings with the latest news, features and articles from our expert writers and editors, including stories about a Micro mollusk breaks the record for the world's smallest snailwhy a An ancient snail wearing a hat may shed light on the mollusk family tree and discovery a a strange marine mollusk that has hundreds of armored eyes.