The fisherman who caught in the waters of the Florida Keys in the south-eastern United States shark, found inside the embryo with two heads.
Fisher retained an unusual specimen and took scientists who described it in his paper published March 25 in the online version of the journal Journal of Fish Biology. "This is one of the few examples of two-headed shark - a total of six were registered - but the sharks bulls is the first time", - said Michael Wagner (Michael Wagner), co-author of the study from the University of Michigan.
Such a defect, referred to as the science of "axial bifurcation", is the result of a stop at a certain point in the process of embryo splitting into two separate body, said Wagner. This is a very rare type of mutation that occurs in a variety of animals, including humans.
"The formation of twins stopped halfway, the division of the embryo stops" - added Wagner.
Two-headed animals usually do not last long in the wild. If it is a predator, it will need to quickly capture prey, which in turn moves too fast, and it’s almost impossible with such a mutation.
Wagner noted that the description of the deformed shark will help to better understand the cause of these abnormalities as in sharks and other animals.
Two-headed turtles and snakes can be met and even purchase from manufacturers, specializing in the breeding of animals with signs of mutation, but the market for these creatures is not great, said Wagner.
Several exhibits two-headed shark can be seen today in the museum in the inset of mutant animals and other creepy curiosities, which in the 1800’s, on the auction sold for big money.
Meanwhile, another reason for the two-headed shark can survive in the ocean is her little body. The animal is very developed two heads, but undeveloped body, said Wagner. All the energy that is required for the formation of the body the shark went to his head.
Original: Livescience.com Translation: M. Potter