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Scientists May Have Found The Oldest Animal Sperm Inside A New Species Of An Ostracod, Called Myanmarcypris Hui. The Sperm, Said To Be 100 Myrs Old, Was Found In An Ostracod Frozen Inside The Blob Of Tree Resin In Myanmar. The Sperm Age Dwarfs The Oldest Known Sample Of A Fossilized Animal (Ostracod) Sperm, Said To Be 17 Myrs Old.

Oldest Animal Sperm to Date Was Just Discovered in 100-Million-Year-Old Amber

https://www.sciencealert.com/oldest-ever-sample-of-animal-sperm-discovered-in-100-million-year-old-amber

A 100-million-year-old chunk of amber has revealed the oldest-ever sample of animal sperm, and each individual cell is enormously long.