Phylum Arthropoda Siebold, 1848 - arthropods
   Subphylum Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
     Class Malacostraca Latreille, 1802
       Subclass Eumalacostraca Grobben, 1892
         Superorder Eucarida Calman, 1904
           Order Decapoda Latreille, 1802 - decapods
             Suborder Pleocyemata Burkenroad, 1963
               Infraorder Brachyura Latreille, 1802 - true crabs
                 Section Eubrachyura de Saint Laurent, 1980
                   Subsection Heterotremata Guinot, 1977
                     Superfamily Majoidea Samouelle, 1819
                       1 Family Epialtidae MacLeay, 1838
                       2 Family Inachidae MacLeay, 1838
                       3 Family Inachoididae Dana, 1851
                       4 Family Majidae Samouelle, 1819
                       5 Family Mithracidae Balss, 1929
                       6 Family Pisidae Dana, 1851
                       7 Family Tychidae Dana, 1851