“We are now sure she was a primitive marine arthropod, but her precise evolutionary relationships remain frustratingly elusive.” Sarah Gabbott, the study’s lead author and a professor in the School of ...

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

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Among these elusive creatures was Helmetia expansa, an arthropod discovered in 1918 by Charles Doolittle Walcott. For more than a century, Helmetia remained an enigma. Only a single specimen had ever ...