 The analysis moves the divergence of the extant suborders from the Devonian Period to the Carboniferous.The opiliones' own divergence is dated to 414 million years ago, and arachnids are estimated to have originated during the late Cambrian to early Ordivician.Genetic analysis performed on a modern "Phalangium opilio" specimen found a suppressed gene that, if active, would generate a second pair of eyes at the lateral location, providing independent evidence that four eyes is the ancestral condition.