The strange “alien” skull, which is brown and measures around 16 cm in circumference, was found in China.
A small conference was held in Beijing last month where science fiction author and researcher Li Jianmin presented his discovery.
He asserts that it has two “different layers” rather than being human.
The 55-year-old said that a private collector in Inner Mongolia Autonomous Region had purchased the unusual skull from a street vendor there.
The collector noticed that the skull closely resembled the one in an illustration while reading Li’s book, she said.
“He asked me to confirm its origins.”
The collector got in touch with Jianmin, who set about producing a 103-page study over the subsequent four months to support claims that the skull is real.
The author said that he carried out a Raman spectroscopy and used an atomic force microscope to compare the cranium with other alleged alien skulls found in other countries.
However, Li said he needs funds to continue with further tests.
According to him, DNA analysis costs about 100,000 RMB (11,200 GBP).
Jianmin insists that the skull is authentic despite being widely criticized on social media, saying: “I welcome questioning and skepticism, but if you desire to dispute me, be sure to bring along evidence.”
Some people weren’t persuaded by the discovery.
Others, however, praised it as evidence of a long-extinct alien civilization.
One replied on Twitter: “This is not real.”
Another said: “That is not a skull.”
But a third argued: “OMG this is amazing. This is proof we were not the first ones here.”
This isn’t the first “alien” discovery to baffle experts.
A skeleton which has a dramatically elongated skull and an underdeveloped jaw and face was found in Chilie’s Atacama Desert in 2003.
The bizarre find sent conspiracy theorists wild – with people suggesting the bones were those of an aborted fetus, a monkey, or even an alien that had crash-landed on earth.
But researchers concluded the skeleton belonged to a human.
And another bizarre “cone-shaped skull” was discovered earlier this year.