Seamaw

A descendant of the scuttlers, the seamaw has taken up a new niche that until then had gone unexploited by them, the open waters. Capable of swimming to a limited degree, the seamaw uses two of its three pairs of limbs as flippers, while its third has become fused with the tail. While certainly not the fastest thing in the sea, the seamaw instead tends to drift lazily in the current, using its massive maw to swallow whole much smaller species of zooplankton, such as the larvae of scuttlers and gilltails, utilizing it's teeth-like projections to prevent them from escaping. Tiny "hairs" on their upper jaws help them to sense vibrations, and are used to detect when prey is near or when predators are approaching. Should the later be detected, the seamaw will swim off with a flick of its tail, and seek out flora or debris to hide in. Larval seamaw resemble miniature versions of the adult, and hatch from tiny planktonic eggs that are lain during the full moon.