For years, this fossil seemed to tell a thrilling story. Here was an animal from more than 300 million years ago that ...

Modern Nautilus and Allonautilus species inhabit deeper waters than their extinct ancestors did over 500 million years ago.

The world's oldest octopus fossil is no longer an octopus. A new study by researchers says the 300-million-year-old creature ...

Skeleton season may be just around the corner, but the skeleton age dawned with the early Cambrian Period, about 538 million to 506 million years ago. Subscribe to our newsletter for the latest ...

An examination of an aquatic, shrimplike creature that lived half a billion years ago offers insight into how arthropods with mandibles became so common. By Rebecca Dzombak About 70 percent of the ...