With few exceptions – an exquisitely-preserved body fossil here, some calcified bits of skeleton ... how this strange shark might have fed. Lebedev's 2009 restoration of Helicoprion.

Picture a shark-like animal, not with rows of razor-sharp teeth like modern sharks, but with a jaw that unfurls into a perfect spiral—like a buzzsaw made of teeth. Meet Helicoprion, the ...

The Helicoprion also likely ate soft-tissued prey such as squid, rather that hunting creatures with hard shells. Another major find was that this famous fish, presumed to be a shark, is more ...

"Helicoprion looked a lot like a big-bodied modern shark, but it had a very unusual mouth,” Tapanila said. "An arc of 15 to 18 serrated teeth were exposed in the center of its lower jaw ...

POCATELLO - The Idaho Museum of Natural History has added to its already impressive collection of prehistoric shark fossils. The newest fossil is a spiral of teeth from a Helicoprion - a ...

For more than a century, scientists questioned: What were they? Answer: The killer jaws of the Helicoprion, an evolutionary outlier from 275 million years ago.

The shark skeleton refurbished by Kraniata and pictured below is a short-finned mako (Isurus oxyrinchus), one of two living mako sharks. (The other being the long-finned mako.) Sebastien Enault ...

“Acanthodians are not at all shark-like in shape, for example they have diamond-shaped scales and spines in front of all the fins,” says Emma. “But they do have a cartilage skeleton, a shark-like ...

With few exceptions - an exquisitely-preserved body fossil here, some calcified bits of skeleton ... shark might have fed. There is obviously a long and rich history of debate surrounding ...