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Organism
  Chromista
         [Microbe]
      Chrysophyta
            Bacillariophyceae
                          Mactroidea
                            Mactridae
                                     Mactromeris
                                             Mactromeris catilliformis
                                             Mactromeris polynyma
                                     Mactrotoma
                                             Mactrotoma californica
                                             Mactrotoma fragilis
                                     Mulinia
                                             Mulinia lateralis
                                     Rangia
                                             Rangia cuneata
                                     Simomactra
                                             Simomactra falcata
                                     Spisula
                                             Spisula solidissima