The pufferfish responsible for building mysterious circles on the sea bed has been named as a new species
When researchers discovered the pufferfish was the answer to a long-standing underwater puzzle, their documentation also showed the culprit to be very different from any of its known relatives.
Beautiful circular designs have been spotted on the Japanese sea bed since 1995, but until recently their origins remained a mystery.
Finally a pufferfish was observed building the sandy structures and last year the behaviour was shown to be a tactic for attracting mates.
The study also provided clear underwater images of the pufferfish from which researchers spotted the possibility that the species was new to science.
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