Crinoids are a primitive animal related to the modern starfish. They come in a variety of colors and make beautiful shapes and designs. See also Orange Crinoid Curl. They are often found hanging on sea fans or soft corals, as the currents push food particles through their "feathers". Please see also Light Pink Soft Coral with Crinoids. On this particular dive trip there were far more crinoids than I had seen in one place before. It was here that I saw crinoids swimming for the first time. Apparently they were looking for more space to hang out to feed. They used their "feathery" appendages to propel themselves.
This image is available in the standard and square formats. The maximum sizes are 13 x 20 and 10 x 10 respectively.