Orangutan Crab in strong current_01

The Orangutan Crab, aka Hairy Crab, or Decorator Crab, is tiny, its body appr. 2 cm, but has extra long arms covered in fine, reddish hairs which serve as camouflage against predators and also capture plankton and other organisms for the Orangutan Crab to feed on.
 
Scientific Name:  Achaeus japonicus