| 1887 Hexacontium laevigatum - Haeckel p. 193, pl. 24, fig. 6 | | 1966 Hexacontium laevigatum - Benson p. 153-155; pl. 4, figs. 4-5 | | 1977 Hexacontium laevigatum - Molina-Cruz p. 333; pl. 2, fig. 7 | | 1979 Hexacontium laevigatum - Nigrini and Moore p. S46-S47; pl. 5, figs. 21-2b | | 1987 Hexacontium laevigatum - Boltovskoy and Riedel pl. 1, fig. 28 | | 1999 Hexacontium laevigatum - Boltovskoy p. 182; fig. 16.31 |
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