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

For over a century, scientists have been puzzled by a mysterious fossil called Helmetia expansa, an ancient arthropod from ...

The new study found the characteristics in Helmetia expansa differed from previous studies. It is said that these species had ...

For over a century, the Cambrian arthropod Helmetia expansa remained a mystery. Discovered by paleontologist Charles Doolittle Walcott in 1918, it was ...