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

More than two decades after scientists identified a fossil as the world’s oldest octopus — officials now say it wasn’t one at ...

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

A fossil once believed to show the world’s oldest imprint of an octopus – some 300 million years old – is actually another ...

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

The species in question was a therapsid, a group of animals that was the forefather to modern-day mammals, including humans.

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 ...