The ‘Tully monster’ is a vertebrate

The Briggs lab dug into a nearly 50-year old mystery when they began investigating the Tully monster (Tullimonstrum gregarium) – an animal found in 300 million year old coal deposits in northeastern Illinois. This oddly-shaped animal was an enigma because it could not be assigned to a phylum. The team studied nearly 2,000 fossils over the course of their study and concluded that The “Tully Monster” is a Vertebrate.