👉 Chasmognathus is a genus of extinct, arachnids from the Mesozoic era that lived in North America during the Permian period around 291 million years ago. These arachnids were characterized by their large size and long, flexible bodies, which allowed them to crawl or glide through the sand on land. They are known for their unusual body structure, including a series of eight pairs of spiral-like arms that form the spine and four pairs of legs that
