This jelly is all about light, which is to say this jelly is all about the dark. Without these spot lights this jelly disappears, and, of course, red looks black even just below the surface. And in the deep sea, where the bloody-belly comb jelly lives below 1,000 feet in the North Pacific, it is very dark. These jellies, then, hide in plain sight. Which is a shame, because they're beautiful, particularly the light diffraction of the combs. Predators and prey wouldn't see those incredible colors.

Technically, these are ctenophores, meaning that they are not true jellies, but the name is sticking, even though it is a new name for a non-jelly. These were first collected off San Diego in 1979 and described in just 2001.