What Am I?

Clue 1: I am a type of ocean animal that has a shell.

Clue 2: I have 2 antennae which I use to feel things.

Clue 3: My eyes are on the end of
my eyestalks.

Clue 4: You will often find me in rock pools at the beach.

Clue 5: I like to walk sideways instead
of forwards.

Clue 6: I have two large claws and eight other legs.