• Eupagurus is commonly called ‘Hermit Crab’ – Marine crustacean.

• Always lives in inside empty shell of gastropod.

• Keeps sea – anemone on the shell. Hermit crab and sea – anemone exhibit ‘Facultative mutualism’.

• Body consists of 2 regions – Cephalothorax and abdomen.

• Cephalothorax is covered by carapace.

• A pair of stalked compound eye, a pair of antennules, a pair of antenna and 5 pairs of thoracic legs among which 1st pair of thoracic leg is chelate.

• Abdominal appendages of right sides are absent.

• The uropod is hook like and used for attachment to the shell.