One odd-looking creature
Since the so-called Tully monster's discovery in 1958, fossils of the odd-looking creature have mystified scientists. Now, two 2016 studies using cutting-edge technologies and a team of collaborative experts have announced that the approximately 307-million-year-old fossils — which, incidentally, are the state fossil of Illinois — are vertebrates. one study found that they were are jawless fish, similar to modern lampreys.
The other found that they were vertebrates, and likely "a type of very weird fish."
Tully monster, envisioned
An illustrator's interpretation of the Tully monster (Tullimonstrum gregarium). Notice its hammerheadlike eyes and its toothy mouth at the end of its proboscis.
The Tully monster likely used its tail to propel it forward in the water.
First Tully monster fossil
The first fossil ever found of the Tully monster. Notice its proboscis folded over its head at the top.
The toothy mouth at the end of the long proboscis. The dark spot on the right might be the remnants of an organ, the researchers said.
A sideways view of a Tully monster specimen. Notice its long eye bar pointing diagonally on the right side of the fossil.
A fossil with a folded tail, with the dorsal fin extending from the fifth skeletal muscle in the middle of the specimen.
Oh, that face!
This specimen shows a clear view of the Tully monster's eyes (right), proboscis (middle) and mouth (left).
It's all in the eyes
An microscopic image of Tully monster's peculiar eyes.
Thomas Clements and Sarah Gabbott search for the Tully monster in Illinois, where Tully is the state fossil.
A star is born
The Tully Monster is so famous in Illinois, that it's even featured on U-Haul trucks.