Wider than they are long, ray crabs are highly flexible herbivorous crustaceans that only swim sideways by undulating their bodies (a few relatives in the reefs can also walk sideways on multiple rows of short legs). They often have reduced or absent legs, but have a separate set of feeding claws for each mouth. There are many genera, including stripe crabs (5 mouths), grazing crabs (9 mouths), and ribbon crabs (15 mouths). They can range from three centimeters long to fifteen meters long.
Written by Daniel Noe, ChampionOfTheGalaxy.com