Our re-study of the specimens has shown that it is a very strange lamprey, a group of eel-like vertebrates that live in rivers and seas today. Up to about 14 inches (35 cm) long, it had a vertical tail fin and a long, narrow dorsal fin. "I was blown away when the results started coming in. The notochord previously had been identified as the gut."I would rank the Tully Monster just about at the top of the scale of weirdness," said paleontologist Victoria McCoy of Britain’s University of Leicester, who conducted the study while at Yale University. For more than half a century, scientists have scratched their heads over the nature of an outlandishly bizarre creature dubbed the Tully Monster that flourished about 307 million years ago in a coastal estuary in what is now northeastern Illinois."

The research was published in the journal Nature.A sophisticated reassessment of the fossils determined it was a vertebrate, with gills and a stiffened rod, or notochord, that functioned as a rudimentary spinal cord and supported its body."I’ve always loved detective work, and in paleontology it doesn’t get much better than this," said paleontologist James Lamsdell of the American Museum of Natural History in New York. "This puzzle has been gnawing at paleontologists," said Field Museum paleontologist Scott Lidgard, whose museum holds 1,800 specimens of Tullimonstrum, the official state fossil of Illinois."Tullimonstrum shared its shallow marine environment with fish including sharks as well as jellyfish, shrimp, amphibians and horseshoe crabs.It is called the Tully Monster in honour of amateur fossil-hunter Francis Tully, who first found it in Illinois coal-mining pits in 1958 and brought it to experts at the Field Museum in Chicago."It fed by grasping things with the proboscis (snout) and scraping bits off with its tongue.It boasted a torpedo-shaped body, a jointed, Threaded Rod Astm trunk-like snout ending in a claw-like structure studded with two rows of conical teeth, and its eyes were set on the ends of a long rigid bar extending sideways from the head. end-of. We don’t know what it ate or if it was a predator or scavenger," McCoy said.For more than half a century, scientists have scratched their heads over the nature of an outlandishly bizarre creature dubbed the Tully Monster that flourished about 307 million years ago in a coasta A Tullimonstrum gregarium fossil.But researchers on Wednesday announced they have finally solved the mystery.They analysed numerous fossils of the creature, named Tullimonstrum gregarium, and determined it was not a segmented worm or a free-swimming slug, as once hypothesised, but rather a type of jawless fish called a lamprey

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