For over a century, the Cambrian arthropod Helmetia expansa remained a mystery. Discovered by paleontologist Charles ...

News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only.

A mysterious fossilized creature discovered more than a century ago has finally been decoded, offering stunning insights into ...

All animal evolution for the last half billion years has come from tinkering with these Cambrian body plans. Then, between about 570 and 530 million years ago, another burst of diversification ...

Researchers formally describe Helmetia expansa, offering new insights into its anatomy, behavior and evolutionary relationships.