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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Holothuroidea
                   [Cryptosyringida]
              Aspidochirotacea
                    Elasipodida
                            Elpidiidae
                                     Amperima
                                             Amperima naresi
                                             Amperima rosea
                                                   [Periamma rosea]
                                     Elpidia
                                             Elpidia glacialis
                                     Irpa
                                             Irpa abyssicola
                                     Kolga
                                             Kolga hyalina
                                     Peniagone
                                             Peniagone dubia
                                             Peniagone gracilis
                                                   [Scotoannassa gracilis]
                                     Periamma
                                     Scotoannassa
                                     Scotoplanes
                                             Scotoplanes clarki
                                             Scotoplanes globosa
                                                   [Scotoplanes theeli]