Wellfleet Lifeguards said the spine had probably been buried under the sand "for quite some time" before it was exposed by Hurricane Teddy.
Marine biologist describes injuries sustained by the sharks in South Africa after being hunted by orca.
Pictures and video footage taken by onlookers show multiple large sharks were attracted to Bulli Beach, close to the city of Wollongong in the Illawarra region of New South Wales.
The tooth measures around 1.8 inches long and 1.1 inches wide.
The man suffered severe injuries to his leg and paramedics were unable to save him.
The image, showing an up-close glimpse of the apex predator swimming through clear water, was published to Twitter by the Atlantic White Shark Conservancy this week.
Witnesses said other surfers rushed to his aid at the time of the attack.
The Maine Department of Marine Resources said a woman was injured while swimming off Bailey Island.
The Cape Cod region has seen a steady increase of great white shark sightings over the last decade, according to the Atlantic White Shark Conservancy's website.
Eyewitnesses believe the shark was a great white, although this has not been officially confirmed.
Michael Lemire filmed the shark while out fishing with his family and later confirmed that it was a great white shark with the Atlantic White Shark Conservancy.
The great white shark was seen attacking the humpback whale off the coast of South Africa.
It was the latest satellite ping from the apex predator, previously recorded approaching Bermuda as part of a research project detailing the species' behaviors and movements.
Sea Rescue South Africa warned there had been an increase in great white sightings in recent weeks.
"Water certainly doesn't hold the same appeal for me or my family that it once did and for now, that's fine. I was lucky once. I won't be testing that luck again any time soon," the teenager said.
Researchers conducted the first ever detailed study of the diets of great whites off the east coast of Australia.
"They did everything they could to try and save his life, but despite their best efforts, were unable to do so," a local ambulance inspector said.
The government has called for review of shark conservation following concerns fishing may have led to a drop in shark numbers.
The site was discovered by chance by scientists studying fossilized shark and ray teeth at three locations in South America.
Unama'ki is one of the many sharks currently being tracked by experts from the U.S marine data organization OCEARCH.
Scientists were examining what impact marine megafauna extinctions will have on oceans.
Pings from the shark's transmitter suggest she is 200 miles off the Virginia coast.
The man was in New Zealand fishing when he was approached by the 8.2-foot white shark. "I heard him before I saw him," he recalled.
The North Carolina coast is a popular hangout for white sharks. While the species can be found in Carolina coastal waters year-round, they are most commonly spotted in the winter and in early spring.
Ironbound was first tagged last fall in the waters off West Ironbound Island, Nova Scotia.
Scientists describe the first observation of a white shark attacking and killing a humpback whale, following a sighting in Mossel Bay, South Africa.
Nick Minogue and a friend were out on the water near Pauanui Beach in New Zealand when the shark attacked.
Video footage taken by diver Jim Cocci shows footage of the great white shark, believed to be a pregnant female, during a dive on Tuesday.
The megalodon could reach lengths of 48 to 60 feet and went extinct approximately 3 million years ago. A fossil of the prehistoric shark was found washed up in the sands of the Cayman Islands.