A deep-sea expedition off the coast of Argentina has captured stunning footage of more than 40 never-before-seen species. One unexpected star of the show is a plump sea creature that has been dubbed the "big-butt starfish" for its uncanny resemblance to Patrick Star from SpongeBob SquarePants. The sea star, which has become a viral hit on social media, belongs to the genus Hippasteria, which is known for its thick central disc and short, stubby arms. Argentine scientists involved with the expedition have offered a couple hypotheses for the creature's attention-grabbing anatomy. The starfish may simply be well fed, since they are voracious carnivores. It's also possible that its rounded appearance could be the result of gravity, as it was filmed on a vertical surface with its central disc hanging downward, creating the illusion of glutes. Starfish don't have rear ends like humans do. Instead, they exhibit radial symmetry, with a mouth located on the underside of the central disc where it presses against the seafloor, where feeding occurs. So far, the expedition has documented at least 25 species of fish that have never been recorded in the South Atlantic.
