• Carapace quadrangular,orbits deep and large
• chelipeds unequal
• antennular flagella rudimentary,completely hidden beneath front

• Carapace broad,rectangular
• eyestalk remarkably long
• external maxillipeds leave more or less wide median hiatus

• Carapace subglobose
• interantennular septum broad
• merus of legs usually bears a tympanum
• chelipeds mostly symmetrical

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