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This is a decorator crab, family Majidae which includes both spider crabs & decorators. There are a couple of decorators that are easily recognizable by the type of animals & algae they stick on their backs. Unfortunately this isn't one of them.

This is a decorator crab, family Majidae which includes both spider crabs & decorators. There are a couple of decorators that are easily recognizable by the type of animals & algae they stick on their backs. Unfortunately this isn't one of them.

Thanks leslie. I thought the large eyes were unusal for a crab, and his size about 1 cm only. I dont recall the depth. It was in the northeastern waters of fiji, on a night dive

Thanks leslie. I thought the large eyes were unusal for a crab, and his size about 1 cm only. I dont recall the depth. It was in the northeastern waters of fiji, on a night dive

Large eyes? You mean the big dark blue patches? Those are probably polyps of some kind (could also be tunicates or sponge). There's one eye in the photo. It's pinkish-red, and about halfway between the two polyps on the lower edge of the body.

Both eyes are in the photo - the other is to the left and up on a 45deg diagonal from the one you pointed out, Leslie.

I was only using one of my own, obviously!