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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Crinozoa
            Crinoidea
                   [Eucrinoidea]
              Articulata
                    Bourgueticrinida
                            Bathycrinidae
                                     Democrinus
                                             Democrinus brevis
                                     Monachocrinus
                                             Monachocrinus caribbeus
                                     Rhizocrinus
                                             Rhizocrinus lofotensis