Scientists from the Centre for Environmental Fisheries and Aquaculture Science (CEFAS) have made an intriguing discovery off the southwest coast of England. During expeditions conducted in 2018 and 2019 in the western Channel and Celtic Sea, researchers stumbled upon a previously unknown species of sea creature. Named Pleurobranchaea britannica, this newfound species, resembling a side-gill sea slug, measured between two and five centimeters.