Smithsonian Magazine on MSN
Leeches May Be 200 Million Years Older Than We Thought—and Haven’t Always Sucked Blood
Their tissue decomposes almost immediately, and their boneless bodies rarely fossilize. But a geological formation in Wisconsin preserved a leech fossil for 437 million years, a new study finds. It’s ...
A newly described fossil reveals that leeches are at least 200 million years older than scientists previously thought, and that their earliest ancestors may have feasted not on blood, but on smaller ...
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