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Description
Tullimonstrum gregarium is one of those weird creatures from the Middle Carboniferous, 300 million years ago. Its fossils come from the Mazon Creek fossil beds, Illinois.
The Tully Monster has one of the weirdest looks with its soft, up to 30 cm long body, eyes placed on stalks, a pair of fins on the end of its "tail" and a proboscis with teeth. It was for a long time a mystery what kind of animal it was: a mollusc, an arthropod, a conodont or some kind of worm? Now in 2016, scientists finally found the answer after investigating all the more than 1200 specimens we have of it. They discovered Tullimonstrum had gills and a notochord (a rudimentary spinal cord).
This means the Tully Monster is a vertebrate, particulary a stem-lamprey, a jawless aquatic animal more primitive than fishes.

It's thought to have lived in shallow water where it searched for prey and other stuff it could eat in the substrate with its toothed proboscis.

Description
Tullimonstrum gregarium is one of those weird creatures from the Middle Carboniferous, 300 million years ago. Its fossils come from the Mazon Creek fossil beds, Illinois.
The Tully Monster has one of the weirdest looks with its soft, up to 30 cm long body, eyes placed on stalks, a pair of fins on the end of its "tail" and a proboscis with teeth. It was for a long time a mystery what kind of animal it was: a mollusc, an arthropod, a conodont or some kind of worm? Now in 2016, scientists finally found the answer after investigating all the more than 1200 specimens we have of it. They discovered Tullimonstrum had gills and a notochord (a rudimentary spinal cord).
This means the Tully Monster is a vertebrate, particulary a stem-lamprey, a jawless aquatic animal more primitive than fishes.

It's thought to have lived in shallow water where it searched for prey and other stuff it could eat in the substrate with its toothed proboscis.