Images: World's Oldest Petrified Sperm

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Modern Ostracod

Credit: Renate Matzke-Karasz
A modern ostracod (Newnhamia). These tiny crustaceans create sperm longer than their own bodies.
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Stephanie Pappas

Stephanie interned as a science writer at Stanford University Medical School, and also interned at ScienceNow magazine and The Santa Cruz Sentinel. She has a bachelor's degree in psychology from the University of South Carolina and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what her latest project is, you can follow Stephanie on .
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