Overview
The Bloody-belly Comb Jelly (Lampocteis cruentiventer) is a mesmerizing deep-sea ctenophore first discovered by researchers from the Monterey Bay Aquarium Research Institute (MBARI) in 2001. Drifting silently through the pitch-black midwater zones of the Pacific Ocean, this gelatinous predator is celebrated for its deep ruby-red belly and pulsating rows of iridescent comb plates that shimmer with rainbow diffraction patterns.
Biology and Physical Characteristics
Belonging to the order Beroida, Lampocteis cruentiventer possesses an elliptical, bell-shaped body made of transparent mesoglea. Its defining anatomical feature is an intensely pigmented, blood-red stomach lining. Running along the exterior of its body are eight longitudinal comb rows (ctenes) lined with thousands of microscopic fused cilia. When these cilia beat in coordinated synchrony to propel the animal, they refract ambient light into sparkling waves of chromatic iridescence that cascade from apex to oral poles.
Behavior and Ecology
In the pitch-black bathypelagic ocean, red wavelengths of light do not penetrate. As a result, the comb jelly’s vibrant red stomach acts as an optical camouflage cloak: when it swallows bioluminescent prey such as glowing krill or lanternfish, the crimson stomach tissue absorbs the blue-green light emissions, preventing the predator from glowing in the dark and alerting larger predators like sharks and squid to its location.
Conservation and Human Impact
Not Evaluated by the IUCN Red List due to the technical challenges of surveying midwater abyssal zones, Lampocteis cruentiventer remains secluded from direct anthropogenic exploitation. However, deep-sea microplastic contamination, ocean acidification, and expanding oxygen minimum zones in the Pacific present prospective ecological concerns for deep pelagic gelatinous fauna.
Interesting Factoid
Although it appears to glow like a neon rainbow, the bloody-belly comb jelly produces no light of its own along its body ridges; its sparkling colors are created purely by cilia diffracting and scattering submersible light rays!
Last updated: October 2026