Taxon tree

Infraorder Anomura
Infraorder Brachyura
- Section Eubrachyura
  - Subsection Heterotremata
    - Superfamily Aethroidea
    - Superfamily Bythograeoidea
    - Superfamily Calappoidea
    - Superfamily Cancroidea
    - Superfamily Carpilioidea
    - Superfamily Cheiragonoidea
    - Superfamily Corystoidea
    - Superfamily Dairoidea
    - Superfamily Dorippoidea
    - Superfamily Eriphioidea
    - Superfamily Gecarcinucoidea
    - Superfamily Goneplacoidea
    - Superfamily Hexapodoidea
    - Superfamily Hymenosomatoidea
    - Superfamily Leucosioidea
    - Superfamily Majoidea
    - Superfamily Orithyioidea
    - Superfamily Palicoidea
    - Superfamily Parthenopoidea
    - Superfamily Pilumnoidea
    - Superfamily Portunoidea
    - Superfamily Potamoidea
    - Superfamily Pseudothelphusoidea
    - Superfamily Pseudozioidea
    - Superfamily Retroplumoidea
    - Superfamily Trapezioidea
      - Family Domeciidae
      - Family Tetraliidae
      - Family Trapeziidae
        
        Genus Calocarcinus
        
        Genus Hexagonalia
        
        Genus Hexagonaloides
        
        Genus Philippicarcinus
        
        Genus Quadrella
        
        Genus Sphenomerides
        
        Genus Trapezia
    - Superfamily Trichodactyloidea
    - Superfamily Trichopeltarioidea
    - Superfamily Xanthoidea
  - Subsection Thoracotremata
- Section Podotremata

Trapeziidae

Family, Miers, 1886

Quadrella coronata, Arthur Anker Florida Museum of natural history