Why penis worm anuses are getting evolutionary biologists all hot and bothered
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. Priapulids have long been classed as protostomes (“mouth first”), a…
