They found dozens of aquatic micro crustaceans called ostracods in a single amber, but they have giant sperm, which is at least one-third the length of the Ostracod. The Ostracod fossil specimens are the most common fossil family, extending from the Ordovician to the present, with a time span of more than 480 million years. But usually, only hard calcified shells are retained, and softer tissue has proved to be very rare. This makes the new discovery quite amazing. The researchers found that 39 ostracod fossil specimens, including males, females and larvae, preserved their reproductive organs in unprecedented detail. < / P > < p > the team used high-resolution micro tomography to analyze amber and create 3D models of their rarely seen soft parts to better understand the animals. Male ostracods, it turns out, have a hook like gripper that they use to hold females while inserting their penises into females. The male sends giant sperm into the female through Zengke’s organ. Amber actually preserves the details of these creatures, and researchers can see the sperm of the female seminal vesicle. < / P > < p > researchers point out that modern ostracods still mate in a very similar way, which means that this mechanism has not changed for more than 100 million years. At this age, the team said, these are the oldest animal sperm samples ever found, about 50 million years ahead of previous records. Didi Qingju bicycle has entered 150 cities