Harvard Scientists Solve 100-Year Mystery of Bizarre 508-Million-Year-Old Arthropod

Helmetia expansa was found to have walking legs and molting behavior, changing assumptions about its mobility and growth. For more than a century, the Cambrian arthropod Helmetia expansa remained a mystery. Discovered in 1918 by paleontologist Charles Doolittle Walcott, it was initially identified as a crustacean. Although frequently mentioned in scientific literature, the species had [...]