ring-legged fiddler crab - uca annulipes - on sandy beach - andaman & nicobar islands, india

andaman annulipes aquatic arthropod arthropoda asymmetric attractive austruca beach biology bioscience black brachyura bright bubbler burrow calling chela claw claws coast coastal colorful crab creature crustacea crustacean decapoda design dimorphic dots fauna fiddler flats food gelasimus geology havelock havelok hevlok india indian island islands legged life mangrove marine marsh mud muddy nicobar ocean oceanic oceanography oceanology ocypodidae orange organism pattern pellets pinnipes red ring salt sand sandy science seafood seashore shore spots swamp terrestrial tropical uca underwater water white