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Insects like ground beetles, crustaceans like calico crabs, and many other animals without spines are known as arthropods. Their nervous systems are made up of a brain and different nerves. Javier Ortega-Hernández, James Weaver, and team studied two fossils of the extinct arthropod Mollisonia symmetrica and identified parts of the species' nervous system. The researchers spotted evidence of nerves extending into the animal's body parts and may have also found rare signs of a synganglion, a brain-like mass of nerves extending into the animal's body parts and may have also found rare signs of a synganglion, a brain-like mass of nerves in the head.