For years, a mysterious fossil specimen defied categorization, until one paleontologist made a surprising discovery.

A 444-million-year-old fossil without a shell or limbs has been discovered in South Africa with soft tissues intact.

Fossils of 444 million-year-old creatures whose bodies were preserved "inside-out" have been discovered in South Africa.

Paleontologists in England discovered the existence of a new marine species that roamed the Earth before the dinosaurs and ...