[1] The worm is round in shape, approximately 10 to 20 millimeters in length (roughly the size of a hazelnut), and bears a strong resemblance to a disembodied pair of buttocks.

"[2] The worm has been observed residing just below the oxygen minimum zone (OMZ) between 875 and 1,200 meters (2,800 to 4,000 feet) deep — even when the sea floor is significantly deeper.

As these worms have shown no ability to swim or otherwise propel themselves through the water, and have no long, protruding appendages to catch prey with, they must rely on filter feeding to survive.

Their unusual size (five to ten times larger than any known chaetopterid larvae) might indicate they were adults, but all currently known species of chaetopterid adults prefer to live in the benthic environment, and live in parchment-like tubes on the sea floor.

Additionally, the worm will produce very small bioluminescent green particles that are dispersed into its mucous cloud, and glow for 1 to 2 seconds before fading.