The Arrowhead Crab’s Latin name is Stenorhynchis seticornis or long-nose bristle-horn, referring to its triangular body with a rostrum that is drawn out to a long point with serrated edges. Its legs are long and thin. It can grow to a length of around six inches and is most commonly associated with anemones, where it is often found along with Pederson’s cleaning shrimp and the spotted cleaner shrimp among the anemones’ tentacles.