Hermit Crab Anatomy

Hermit crabs are unique and beautiful creatures with their anatomy . They have an exciting anatomy which explains much of their actions and behaviors. Here we will discuss Hermit Crab Anatomy.

Hermit crab anatomy


Hermit crab’s anatomy includes the following;


Hermit crab’s eyes are located on the moveable eye stalk. Their eyes are designated with many lenses, which enables them to see many images of an object.

Antenna| Hermit Crab Anatomy

Two pairs of antennas are present as sensory organs. They gather all information about the crab’s surroundings. One pair of antennas is long, used for touch and feel, and the other is short, used to smell and taste.


The head, back part and thorax of hermit crabs are fused. The top of the cephalothorax has a rigid exoskeleton. Generally, The eyes, mouth and antenna are on the head, and the legs are connected to the thorax.


Basically the abdomen of hermit crabs does not have a rigid exoskeleton. It leaves the crab weak, which is why they cover their abdomen with shells.


The exoskeleton of hermit crabs is made up of protein and chitin. The complex and other exoskeleton parts are thin and help in movement. Hermit crab’s exoskeleton protects against predators and aids in controlling water loss.


Also Gills are the organs by which crabs breathe. Indeed Crab’s gills are present in the bronchial chamber. Their Gills act as lungs and should remain moist for crabs to breathe.

Hairs| Hermit Crab Anatomy

Although Hairs are present among the joints of the legs. They are not hairs but extensions of the exoskeleton.



The hard outer shell is a carapace which consists of an exoskeleton covering the cephalothorax.


The five pairs of legs of hermit crabs are responsible for different functions

  1. The first pair of legs have claws that help climb, hold and fight.
  2. The second pair is responsible for walking and detecting food.
  3. The third pair also helps in walking.
  4. The fourth and fifth pairs are small and used to hold crabs inside.


Although A crab’s mouth consists of small appendages known as maxillipeds. They are used for holding and tearing food as well as for grooming.


Pleopods are tiny appendages located on the left side of the abdomen. A female hermit crab fixes her eggs to the hairs of pleopods.


Their small appendages present at the end of the abdomen are called uropods. Infect work hooks onto the shell and enables the crab to grip its shell.


Telson is the tip of the tail of a hermit crab ending in the anus. That was about everything regarding Hermit Crab Anatomy.

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