Stenorhynchus seticornis is the arrow crab. Its body is triangular, with long and thin legs. They are up to 10 cm (3.9 in) across, and the animal's carapace may be up to 6 cm (2.4 in) long. They have a lot of different colors on their bodies. They may be golden, yellow or cream, brown, black or iridescent-blue lines; the legs are reddish or yellow, and the claws are blue or violet.