Yes, crabs are an example of the phylum Crustacea and are the most successful of the extant marine arthropods. Crabs have cephalization but are still able to move sideways. This is because animals in this phylum have many sophisticated appendages that help them sense the environment around them for example lobsters and crayfish can have multiple pairs of antennae, mouth parts, legs, and swimming appendages making them adept at moving forward or sideways. All of this sensory information is still processed in the head region of the crab.
Source:http://www.mansfield.ohio-state.edu/~sabedon/campbl33.htm
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