It's not easy to look at a sea spider and see an animal so representative of its kind that it may help scientists sort out the evolution of almost everything with eight legs. But that's the potential ...

At first glance, the lettuce sea slug (Elysia crispata) looks like a leafy underwater alien. But what’s hiding inside its frilly green body is far more fascinating than its salad-like appearance.

A “strange” creature recorded in the deep waters off the coast of Japan represents an exceptionally rare kind of discovery. With a body shaped like Mount Fuji, the new-to-science sea anemone is not ...