It's a nudibranch, but so distantly related that it gets its own phylogenetic family.
Elizabeth Rayne is a Contributing Writer at Ars Technica and Den of Geek. She focuses on a diverse range of topics including science, natural sciences, and agriculture, with a particular interest in space, NASA, and gaming. Elizabeth's work has been featured in notable publications such as Space.com, Tech News Tube, and Popular Mechanics Magazine.