Bloodybelly Comb Jelly

From a deep operative -

The Bloodybelly Comb Jelly (Lampocteis cruentiventer) is a variety of Ctenophore (simple marine animals), commonly known as comb jelly. Despite its name, this particularly stunning comb jelly ranges in body color from deep red to pale to deep purple, sometimes black. Scientists believe that the deep color of its belly helps mask the Bloodybelly Comb Jelly's bioluminescence from potential predators.