Stenorhynchus seticornis or often-called Yellowline Arrow Crab and sometimes called the Simply Arrow Crab, is a crab that similar with spider that has a triangular body. The color typically reddish brown and covered in white or yellow lines on the shell. They have two small purple claws and reddish brown long thin spider-like legs. The sizes of this crab ranging from 6-10 inches. Yellowline arrow crab usually lives on coral reefs with depths of 10-30 feet. Yellowline arrow crabs appear at night to search food near their shelter. They usually eat algae, detritus, and sometimes tube worms. Arrow crabs that unable to find large prey will eat discarded food by other animals. Grouper, puffers, triggerfishes, wrasses, and grunt