FIGURES 1–35. Pseudostaurosira ellipticolanceolata André, Sabbe & Van de Vijver, sp. nov. LM and SEM pictures taken from the holotype material (BR-4776, Aardenburg sediment core, depth 85 cm, Belgium). 1–21. LM views of several specimens arranged in decreasing size. 22. SEM external view of an entire valve. 23. SEM view of two valves with interdigitating spines (white arrows). 24. SEM internal view of an entire valve, connected to another. 25. SEM external view of an entire valve. 26. SEM internal view of an entire valve. Note the raised virgae bordering the flat sternum. 27. SEM internal detail of the valve apex. The white arrow indicates the apical pore field. 28. SEM external detail of the valve apex. The white arrows indicate the eroded apical pore field. The black arrows indicate the presence of vestiges of the areola coverings. Scale bars = 10 µm (Figs 21, 22, 24, 26), 5 µm (Figs 23, 25, 27), 1 µm (Fig. 28). ... : Published as part of André, Coralie, Sabbe, Koen & Vijver, Bart Van De, 2023, Pseudostaurosira ellipticolanceolata, a new araphid diatom (Bacillariophyta) from Flanders, Belgium, pp. 83-86 in Phytotaxa 591 (1) on page 84, DOI: 10.11646/phytotaxa.591.1.10, http://zenodo.org/record/7784131 ...