1) Devonian arachnid 
Attercopus fimbriunguis belongs to an extinct order of arachnids named Uraraneida; spider-like animals able to produce silk, but which lacked true spinnerets and retained a segmented abdomen bearing a flagellum-like tail resembling that of a whip scorpion. They are thought to be close to the origins of spiders. An important Early Devonian (about {...