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Paleontologists have unearthed the fossils of two 160 million-year-old lamprey species, discovering the once small fish had already evolved into monster chompers – growing more than ten times longer than the earliest lampreys.
"They are characterized by their peculiar feeding behavior of eating blood or cutting off tissues from the hosts or prey to which they firmly attach via their toothed oral sucker."Lampreys' evolutionary history is still hard to figure out, though, because few fossils have been found. The physiological implications of their size, along with other fossil evidence, suggest the newly discovered species had already evolved a three-stage life cycle like today's lampreys.
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