Tag Archives: developmental biologist

Why Penis Worm Anuses are Getting Evolutionary Biologists all Hot and Bothered

25 Jan

by Lauren Davis / IO9

This is a priapulid, otherwise known as a “penis worm,” and if you click the video, you’ll understand how it earned that phallic moniker. These creatures are currently shaking the branches of the animal taxonomy tree thanks to a mystery surrounding their mouths and anuses. Continue reading