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Paired with SOLCrabs generally have an exoskeleton made mainly of chitin [2], and they also have a pair of pincers. The smallest crab is the pea crab, with a body length of only a few millimeters, while the largest is the Coenobita giganteus, which can reach a leg span of up to 4 meters (13 feet) when fully extended [3]. The underside of the short-tailed class is actually the shortened tail plate transformed from the tail plate, which is directly connected to the back of the tail in long-tailed animals such as shrimp, but is located below the abdominal sternum of the short-tailed class. This is the source of the name of this class. Crabs generally have distinct sexual dimorphism features. Male crabs have larger claws, which is especially noticeable in the fiddler crab, where the large claw plays a significant role in attracting a mate [5]. Another distinct feature is their abdomen, where most male crabs have a narrow triangular abdomen, while female crabs have a larger and rounder abdomen, mainly due to the fact that female crabs have a function of storing eggs in their abdomen. Crabs that live entirely in seawater have small creatures like barnacles attached to their shells.
