Exceptional fossils with preserved soft parts reveal that the earliest mollusks were flat, armored slugs without shells. The new species, Shishania aculeata, was covered with hollow, organic ...

Its scientific name is Costasiella kuroshimae, and it is a species of sea slug belonging to the order Sacoglossa, a category of marine gastropod mollusks without shells, from the family Costasiellidae ...

(compelling music) - [Jose] Mollusks and their shells, their lives have been intertwined ... Harry] It happened without my knowledge and without my provocation. - [Narrator] One of Harry's areas ...

are essentially snails without shells, terrestrial cousins of clams and oysters. They are gastropods, slime-producing mollusks that carry their stomachs inside their single “foot,” which is ...