Van Heurck -- Synopsis des Diatomées de Belgique -- Index
| Pseudostictodiscus | eulensteinii Grunow = Triceratium eulensteinii var. irregularis Grunow | Page -- | Plate -- | Figure -- | |
| Pseudostictodiscus | eulensteinii var. irregularis Grunow = Triceratium eulesnsteinii var. irregularis Grunow | Page -- | Plate 110 | Figure 9 |