Ventral nerve cord controlled critter’s many legs
The fossilized remains of an about 520-million-year-old creepy-crawly provides a portrait of an ancient arthropod’s nervous system.
Researchers first described Chengjiangocaris kunmingensis — an ancient relative of spiders, insects and crustaceans unearthed from a fossil bed in southern China — in 2013. Further imaging and investigation of five new fossilized specimens reveal exceptionally well-preserved soft tissue and a ropelike structure running down the animal’s belly. That structure is the remains of a ventral nerve cord, Xi-guang Zhang of Yunnan University in Kunming, China, and colleagues explain February 29 in the Proceedings of the National Academy of Sciences.