Rare teeth from ancient mega-shark found on Australia beach
Melbourne - AFP
Philip Mullaly was strolling along an area known as a fossil hotspot at Jan Juc, on the country's famous Great Ocean Road some 100 kilometers from Melbourne, when he made the find.
He told Museums Victoria, and Erich Fitzgerald, senior curator of vertebrate paleontology, confirmed the seven centimeter-long teeth were from an extinct species of predator known as the great jagged narrow-toothed shark (Carcharocles angustidens).
The shark, which stalked Australia's oceans around 25 million years ago, feasting on small whales and penguins, could grow more than nine meters long, almost twice the length of today's great white shark.
"These teeth are of international significance, as they represent one of just three associated groupings of Carcharocles angustidens teeth in the world, and the very first set to ever be discovered in Australia," Fitzgerald said.
He explained that almost all fossils of sharks worldwide were just single teeth, and it was extremely rare to find multiple associated teeth from the same shark.
This is because sharks, who have the ability to regrow teeth, lose up to a tooth a day and cartilage, the material a shark skeleton is made of, does not readily fossilize.
Fitzgerald suspected they came from one individual shark and there might be more entombed in the rock.
So he led a team of paleontologists, volunteers, and Mullaly on two expeditions earlier this year to excavate the site, collecting more than 40 teeth in total.
Most came from the mega-shark, but several smaller teeth were also found from the sixgill shark (Hexanchus), which still exists today.
Museums Victoria palaeontologist Tim Ziegler said the sixgill teeth were from several different individuals and would have become dislodged as they scavenged on the carcass of the Carcharocles angustidens after it died.
"The stench of blood and decaying flesh would have drawn scavengers from far around," he said.
"Sixgill sharks still exist off the Victorian coast today, where they live off the remains of whales and other animals. This find suggests they have performed that lifestyle here for tens of millions of years."