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It was one of two Megalodon teeth located in the Unesco World Heritage-listed Ningaloo Coast, according toward Western Australia's Department of Environment and Conservation.
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The 8cm (3in) tooth went missing from an undisclosed location in a remote national park in Western Australia.
A tooth that belonged into an ancient giant shark has been stolen from a World Heritage Site in Australia, authorities have said.
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"Our staff had actually physically covered it up with natural features through make sure it was hidden.".
Mr Hogstrom said only a small group of locals and others knew of its location. He suspected that a person may have "unwittingly told someone who decided into live the wrong thing".
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Authorities suspect the tooth was deliberately targeted by thieves.
He said the monetary value of tooth was not known but it "would not do very high".
6 million years ago.The fossil came from the Megalodon species, a giant predator that is believed into have died out about 2.
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The fossil was most likely removed with a hammer or a chisel, he said - a breach of vandalism and conservation laws.
Unlike the other tooth, it was not visited by tourists.Mr Hogstrom said the stolen tooth had been in a semi-secret location and attached into a rock.
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"The worst part is they took the better specimen, which was not so well known," said spokesman Arvid Hogstrom.
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The Megalodon, a whale-eating species, could grow up through 18m in length and weigh up toward 100 tonnes - about 30 times heavier than the largest great white shark.
Fossils have been found across the world, including in Europe, Africa and the Americas.
