Sea Anemone

The Sea Anemone is very closely related to coral; neither has a skeleton.  They are found everywhere in the oceans, at all depths, but there are a lot in the coastal waters.  They have different colors:  reds, pinks, and yellows, and resemble flowers when feeding and their many extensions, called tentacles, are fully open.  They vary in sizes too!  Some might be small in size and the others might be tall in size.  The ones that live in the Great Barrier off the coast of Australia may reach three feet in diameter at the expanded oral end. 

Most of the Sea Anemone attach temporarily to hard surfaces; some might even thrust themselves into the sand or live in furrows; even some are parasitic on the other marine organisms.  Some of them feed on small particles, which they are caught with the aid of a mucus secretion.  Most sea anemones are predaceous, which means immobilizing their prey with the aid of specialized stinging cells called nematocyst

The burrowing anemone, Cerianthuss, appears on both Pacific and Atlantic coasts; some may reach nearly 2 ft. in length.