A half-billion-year-old penis worm discovered in Arizona has provided scientists with a new understanding of the Grand Canyon’s prehistoric ecosystem. The worm, named Kraytdraco spectatus, was found to have a unique spiky mouth that it used to defend itself. Its discovery sheds light on the evolution of life in the region and suggests that the Grand Canyon was once an evolutionary hotbed.
Source: https://www.washingtonpost.com/science/2025/07/23/penis-worm-grand-canyon-fossil