Recent footage from the bottom of the Pacific Ocean captured activity from another type of bottom — the rear end of a sea cucumber, as it produced a truly impressive amount of sediment-packed poo. The action unfurled on the YouTube channel SouthernIslanderDive, which posts underwater videos of marine life in locations near Japan. At the beginning of the video , shared online July 18, a bumpy-skinned flesh tube squats on the seafloor, an opening at one end — the creature's anus — gaping and closing. The animal, a soft-bodied sea cucumber, then rapidly expels a long, snake-like mass of sandy poo. Rid of some extra weight, it slowly drifts away from the camera, presumably much lighter than it was before.
Comb jellies such as Mnemiopsis leidyi have a through-gut, challenging when this evolutionary innovation arose. The first animals that arose seem to have literally had potty mouths: Their modern-day descendants, such as sea sponges, sea anemones, and jellyfish, all lack an anus and must eat and excrete through the same hole. One apparent advantage of a second hole is that animals can eat while digesting a meal, whereas creatures with one hole must finish and defecate before eating again. However, several unprecedented videos of gelatinous sea creatures called comb jellies, or ctenophores, now threaten to upend the standard view of the evolution of the so-called through-gut.
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