Tseplik, N., Maltsev, Y., Glushchenko, A., Genkal, S., Mironova, E. and Kulikovskiy, M. 2024. New cavum-bearing Planothidium (Achnanthidiaceae, Bacillariophyceae) species from the Kamchatka Peninsula, Russia. Phytotaxa. 665, 3 (Sep. 2024), 271–281. DOI:https://doi.org/10.11646/phytotaxa.665.3.9.