Scientists have discovered jet-black egg capsules on a rock slope in the Kuril-Kamchatka Trench, revealing the deepest known reproduction of free-living flatworms—at over 20,000 feet beneath the ...

Freshwater planarians, found around the world and commonly known as "flatworms," are famous for their regenerative prowess. Through a process called "fission," planarians can reproduce asexually by ...