| 1900 Hexacontium pachydermum - Jørgensen p. 53; not figured |
| 1905 Hexacontium pachydermum - Jørgensen pl. 8, figs. 31 a-b |
| 1909 Hexacontium pachydermum - Schröder fig. 4 |
| 1976a Hexacontium pachydermum - Bjørklund pl. 1, figs. 4-9 |
| 1995 Hexacontium pachydermum - Schröder-Ritzrau not figured |
| 1998 Hexacontium pachydermum - Bjørklund et al. pl. 1, figs. 1-2 |
| 1998 Hexacontium pachydermum - Dolven pl. 5, figs. 3-4 |
| 1998b Hexacontium pachydermum - Cortese and Bjørklund pl. 1, figs. 1-7, 9-11 |
