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.

Get Instant Summarized Text (Gist) A new phylum of microbes, CSP1-3, has been discovered in the deep soil of Earth's Critical Zone, which plays a crucial role in water purification. These microbes ...

The number of their legs also changes throughout their life. Centipedes are arthropods from the class Chilopoda, which means insects with lots of segments and long, flattened bodies. They are also of ...

And yet her durable carapace, legs, and head are missing – lost to decay over 440 million years ago,” Gabbott said in a press release. “We are now sure she was a primitive marine arthropod, but her ...