The Economic Times

The Tully Monster: A Strange Fossil from Illinois That Continues to Puzzle Scientists

Discovered in 1958, the Tully Monster, Tullimonstrum gregarium, has baffled scientists for decades due to its unique traits, defying easy classification as either a vertebrate or invertebrate. Despite extensive research and conflicting findings from various methodologies, its evolutionary placement remains a subject of lively scientific debate, highlighting the complexities of paleontology and scientific revision.