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.
While sea slugs are not uncommon, this particular variation, typically found in warmer Mediterranean waters, took scientists by surprise in the relatively colder UK waters. They speculate that climate change might have played a role in its migration northward.
Initially mistaken for an existing genus, further examination revealed Pleurobranchaea britannica to be a distinct species. Ross Bullimore, a Marine Ecologist at CEFAS, expressed excitement over the discovery, highlighting the continual learning process in understanding the biodiversity of UK waters.
Collaborating closely with the University of Cadiz, researchers confirmed the uniqueness of the sea creature. Dr. Juan Lucas Cervera Currado, a full professor at the University of Cadiz, emphasized the significance of the find, noting the absence of Pleurobranchaea species in the British Isles prior to this discovery.
Moreover, there is speculation that Pleurobranchaea britannica might extend beyond UK waters, possibly inhabiting the west coast of France and the northern coasts of Spain and Portugal. This discovery underscores the ongoing exploration and revelation of new species thriving in our oceans, even in regions thought to be well-explored.