It's not a new species, but it's a heck of a fish story, and this image has to be seen to be appreciated.
British biologist Ian Welch was working with a catch-and-tag fish survey program when he pulled in, on rod and reel, a stingray with a body over two meters long and a tail over three meters. Welch says he would have been pulled out of the boat is a colleague hadn't snagged his belt and hung on. The animal weighed 350 kg. It was successfully tagged and released.