This small jellyfish is called Oceania amata. Its closely related cousin, Turritopsis dohrnii, was recently featured in the media as an example of an organism that may achieve immortality. For now, Turritopsis dohrnii is the only known animal that can develop in reverse, transforming from a medusa back to a polyp.
Researchers have discovered a chemical compound produced by the giant Triton snail (Charoniatritonis), that repels the Crown-of-thorns starfish (Acanthaster planci) and could help protect the Great Barrier Reef. Photo credit: Dr. Scott Cummins.
Lifeform of the week: Horseshoe crabs have something for everyone | Earth | EarthSky - Fisherman, doctors and bird lovers all rely on the Atlantic horseshoe crab. Can this ancient arthropod please all the people all the time?
An island in the Maldives is made of parrotfish poop