A Ph.D. candidate at a Florida university discovered an ancient shark in a coral reef in the Caribbean. Devanshi Kasana, studying at Florida International University (FIU), made the discovery while working with local Belizean fisherman, according to a Monday press release from FIU. Kasana initially believed it was a six-gill shark. “I knew it was something unusual, and so did the fishers,” she said. “(They) hadn’t ever seen anything quite like it in all their combined years of fishing.” The shark turned out to be a Greenland shark, a half-blind animal thought to live mainly in the freezing Arc…