Pliod

At first glance, one might confuse a pliod with a huge crocodile with flippers for legs, with a dark black back and a tan underbelly. The pliod rather belongs to the pliosaur family, and is one of the more savage predators of the Twilight Ocean. Pliods are antisocial creatures, which nonetheless share a lot of beach space as they wallow on the shore in between hunts. They maintain fiercely defended personal space, and it's not uncommon for angry bull pliods to rip each other's faces off over choice patches of turf. In the water they become fearsome and deadly carnivores, capable of catching and eating practically anything smaller than themselves. (And for a Volkswagen-sized predator, this means that animals a pliod can't eat are few and far between. Blue lumuole colonies flow through the animal's body, preventing its blood from freezing in the ice-cold water. They are acquired through dietary means, as most polar fish use the lumuoles for the same purpose. "Hotspots" are extremely numerous in this ocean, and pliods rarely find themselves in the position of having malnourished lumuoles.