B. van De Vijver, A. Coomans, and M. Pottiez, “Planothidium islandicum sp. nov., a new cavum-bearing Planothidium species from the Westfjords, northwestern Iceland (Achnanthaceae, Bacillariophyceae)”, Phytotaxa, vol. 731, no. 2, pp. 183–186, Nov. 2025.