I found this photo on flickr completely by mistake while searching for images and love the contrast of the black brittle star against the red sponge. I have to leave it to the photographer Laszlo Ilyes’ expertise that it is a blunt-spined brittle star on elephant ear sponge as I’m not great on invertebrate ID-ing!
Brittle stars are closely related to starfish, and both are in the echinoderm phylum. Like starfish, brittle stars have five arms radiating out symmetrically from a central disk where their organs and mouth are located; apparently these arms can break off quite easily, but if it has part of the central disk attached a broken arm can regenerate and become a whole new brittle star.
The Animal Explorer 