The halloween hermit crab will grow on average to 2 inches (5.1 cm) in length, which is fairly large in comparison to other hermit crabs. It has a noticeably flattened pure white shield, approximately .315 inches (8 mm) long. It is a nocturnal species, and has been described as "conspicuous". It lives primarily in empty cone shells, mainly those of snails or tritons. Like other hermit crabs, it wears shells in order to protect itself from predators. Its ocular peduncles and antennae are a solid orange and the antennal flagella are transparent. The corneous has parallel ridges on the palm, with similar ridges on the crabs' dactyls (the movable part of their pincers). The halloween hermit crab can live for up to 10 years. Learn more about Halloween Hermit Crab