Sea Pen Scientific Name: Pennatulacea Interesting Facts: 1. The sea pen's name was inspired by antique feather pens given that they look almost identical. 2. Although the Sea Pen is anchored into the ground, it is possible for them to pull the anchor and move to a new spot if they need to. 3. They are classed as an octocoral, which has multiple polyps (a sac-like structure) and each polyp will have eight tentacles.