Free Verse The green spoon worm lives in crevices on the sea floor. The green spoon worm, Bonellia viridis, (the name suggests an Italian movie actress) is characterized by one of the most extreme size differences between male and female. The female green spoon worm spends her life in one spot. The male green spoon worm is 200,000 times smaller than his mate. The male green spoon worm spends his entire lifetime inside the female’s reproductive tract, regurgitating sperm through his mouth to fertilize her eggs. A male green spoon worm can only have one mate; so growing larger is a waste of energy. A green spoon worm larva has no gender. A green spoon worm becomes male or female depending on whether it encounters a female during its first three weeks of life.