Allopetrolisthes punctatus looks like a crab, but belongs to a different group (Anomura) than the crabs that most people think of (Brachyura). Count the legs; this one has 10, but the last two are very small and tucked away, which is characteristic of anomuran crabs but not brachyuran crabs.
From Ivan Hinojosa on Flickr and used under a Creative Commons license.
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