"We named it Tyrannobdella rex because of its enormous teeth," said researcher Mark Siddall, curator in the division of invertebrate zoology at the American Museum of Natural History in New York.
Although its teeth only reach up to 130 microns high — a little more than the width of a human hair — "that's at least five times as high as that of other leeches," Siddall said. "And every one of the people who were found with these in the clinical cases had a frontal headache. Their teeth are big, and these things hurt."
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(image credit: Anna J. Phillips et al., PLoS ONE)