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Leeches May Be 200 Million Years Older Than We Thought—and Haven’t Always Sucked Blood
The biological history of leeches is difficult to study: Their tissue decomposes almost immediately, and their boneless bodies rarely fossilize. But a geological formation in Wisconsin preserved a ...
The fossil leech compared with a modern leech. Double arrows indicate the large caudal sucker used for attachment, single arrows indicate body annulations. A newly described fossil reveals that ...
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