'Ancient alien fish' with 'most extreme bite' are said to capture prey using the death jaw

An ancient, fozziled fish with an extreme underbite has been reanalyzed by researchers.

The 365 million year old creature has been compared to an alien due to its bizarre and terrifying appearance.

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The researchers who first discovered the ancient fossil found it strange that they named it Alienacanthus.

It has long spiny fins and many pointed teeth.

The fish is said to belong to a family of creatures called arthrodires.

Arthrodires are a group of extinct, armored jawed fish that are very different from the fish we see today.

New analysis of the Alienacanthus revealed that one of the suspected long spines was actually its jaw.

That means the fish has one of the longest and oldest underbites ever recorded.

The researchers published their findings in the Royal Society Open Science log.

“This armored 'fish' expands morphological and ecological diversity during one of the first radiations of jawed vertebrates, with a combination of features not yet recorded for arthrodires,” they wrote.

The team of scientists believe the long jaw was used to catch prey.

They said: “The dentition suggests a function of capturing and capturing live prey.”

“This animal is so unique that the entire jaw mechanism had to work a little differently to accommodate the lower jaws.” lead study author Melina Jobbins said Living Science.

It is thought that the unusually poisoned teeth prevented prey from escaping after being trapped in the large jaw.

The finish may also have used its mouth to sift sediment.

Researchers believe the fish lived at a time when the Earth was divided into two supercontinents.