The mysterious ‘Tully monster’ didn’t have a spine after all
Since its discovery nearly 70 years ago, paleontologists have debated the lineage of the mysterious “Tully monster.” The six-inch-long, stalk-eyed creature lived over 300 million years ago in the seas of modern-day Illinois. Its unique anatomy has long challenged researchers, making it difficult to identify as either a vertebrate or invertebrate–one of the first steps…