Snails have shells the moment they're born, but it's kind of hard to tell. In fact, it's hard to even see a baby snail. Some are nearly microscopic, such as Angustopila psammion, whose adult-sized ...

Tsukuba, Japan—Mollusks exhibit diverse shell morphologies, such as those seen in bivalves (e.g., clams) and gastropods (e.g., snails). Understanding the mechanisms underlying shell formation requires ...