Unidentified octopus (Rex Features)

Not all of the species discovered during the 2010 expedition off the coast of Newfoundland in Canada could be identified. This octopus was one such species. Kevin MacIsaac, a Bedford Institute of Oceanography taxonomist, said 30 to 40 species of coral and sponges were found, although there were several species he could not identify. "It was kind of embarrassing," he said. "Time and time again, we were going forward and saying, 'We don't know what it is.' And, they'd say, 'What do you mean, you don't know what it is?'"