27/03/2013 11:21 GMT | Updated 27/03/2013 11:43 GMT

Two-Headed Bull Shark Found Near Florida Keys Has Axial Bifurcation (PICTURES)

A two-headed bull shark foetus has been found by fishermen in the Gulf of Mexico.

The specimen is the first recorded incidence of the condition, known as axial bifurcation, in a bull shark or Carcharhinus leucas.

The find was published in the Journal of Fish Biology.

two headed bull shark

This live two-headed bull shark foetus was found in the Gulf of Mexico

It noted: “External examination, Radiography and magnetic resonance imaging revealed a case of monosomic dicephalia where the axial skeleton and internal organs were found to divide into parallel systems anterior to the pectoral girdle resulting in two well-developed heads.”

Michael Wagner, a study co-author and researcher at Michigan State University said the deformity is the result of an embryo beginning to split into twins, but doing so incompletely.

SEE ALSO: Two-Headed Lamb Born In Tarkwa, Ghana (PICTURE)

The foetus was live when it was found, but probably wouldn’t have lived for very long in the wild, Wagner told OurAmazingPlanet.

He said: "When you're a predator that needs to move fast to catch other fast-moving fish … that'd be nearly impossible with this mutation."

A further reason the shark wouldn’t have lived long is its small body.

Wagner added: “It had two very developed heads, but a very stunted body.”

two headed shark

Sharks can be deadly and in many ways mysterious. But in the 35 years since

Photo gallery Two-headed animals and other bizarre creatures See Gallery