Scientists have just named an ancient shark after an 80s video game, and it's not just any ordinary shark.
"The discovery of sharks here is fascinating because the Hell Creek Formation was deposited on land, so either these teeth were being transported from another habitat or they may have been swimming up freshwater rivers, much like bull sharks do today".
The look of the teeth was impressive enough-resembling that of the player-controlled, space fighters from the memorable 80s video game Galaga.
Fossilized shark teeth were discovered in what is now modern-day South Dakota and were found in the same deposits as Sue the Tyrannosaurus rex, perhaps the famous T. rex specimen fossil ever unearthed.
Its teeth were found embedded in a rock removed from a T. rex skeleton in South Dakota almost 30 years ago.
Field Museum curator of dinosaurs Pete Makovicky said the teeth fossils of a shark now called Galagadon Nordquistae was found in the sediment that surrounded the T-Rex Sue which is on display at the Museum. The teeth are only a millimeter wide - about the diameter of the head of a pin.
"This shark had teeth that were good for catching small fish or crushing snails and crawdads", says the paper's lead author Terry Gates, a lecturer at North Carolina State University.
The tiny teeth - each measuring less than a millimetre across - were discovered in the sediment left behind when palaeontologists at the Field Museum in Chicago uncovered the bones of "Sue", now the most complete T. rex specimen ever described.
Discovering the shark in the same space as T. rex adds to our understanding of the landscape that would have existed in the region at the time. "Without a microscope you would just throw them away", he said.
"It amazes me that we can find microscopic shark teeth sitting right beside the bones of the largest predators of all time".
But while Galagadon wasn't breaking any size records, its discovery is making scientists question what they thought they knew about the area where SUE the T. rex was found.
According to the Field Museum, the study also reflects the importance of learning about fossils beyond big, flashy dinosaurs.
An illustration showing what Galagadon nordquistae would have looked like in life, swimming along the river floor.
Eric Gorscak, research associate at the museum and co-author, said: "Today, carpet sharks, which include bamboo sharks and wobbegongs, mostly live in the waters in southeast Asia and Australia, so it's surprising to find their fossils at the Sue locality".