1887 Amphisphaera pluto - Haeckel p 144; pl 17, figs 7, 8 | 1889 ?Xiphatractus stahli - Dreyer p. 129-130; pl. 6, fig. 17 | 1958 Stylatractus neptunus ? - Riedel p 226; p1. 1, fig. 9 | 1966 Xiphatractus pluto - Benson p. 184-186; pl. 7, figs. 14-17 | 1983 Xiphatractus pluto - Benson p. 510; pl. 5, figs. 1-2 |
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