Fossil Evidence Suggests Spiders' Ancestors Originated in the Ocean
A 500-million-year-old fossil analysis suggests that spiders and their relatives may have originated in the sea before adapting to land, challenging the long-held belief that arachnids have always been terrestrial creatures. The study reveals that the brain organization of the extinct Mollisonia species resembles that of modern spiders, indicating a marine origin for these arachnids.
