scitechdaily.com
The Oldest Leech Ever Found Is Nothing Like Today’s Bloodsuckers
A 430-million-year-old fossil has pushed the origin of leeches back by more than 200 million years, revealing that these ancient creatures began as marine hunters, not bloodsuckers. Discovered in Wisconsin’s Waukesha biota, the rare fossil preserves a tail sucker but lacks the forward sucker used by modern leeches to pierce skin. This suggests early leeches [...]
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