This scanning electron micrograph shows a bundle of such giant sperm extracted from the ostracod Eucypris virens, which are approximately 1.8 mm long. The length of sperm of freshwater ostracods can reach up to 10 times the body length of its producer. Research published in the June 19 issue of the journal Science suggests the giant sperm were around in ostracods 100 million years ago. Credit: Renate Matzke-Karasz