Crustacea Resources | Natural History Museum of Los Angeles

This squat lobster from the family Galatheidae is not a lobster at all, it is more closely related to hermit crabs and porcelain crabs.
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What's On This Crab?

Decorator crabs (superfamily Majoidea) use their claws to collect bits of invertebrates and algae from their environment and attach them to their exoskeletons.  They have hooked bristles, or setae, on their carapace that hold the decorations in place.  These decorations provide camouflage and chemical defenses to help protect them from predators.

 

Crustacea Resources