WILLIAMS, David M., & Saúl BLANCO 2020 (Feb. 19) '2019' Studies on type material from Kützing's diatom collection II: Synedra acus Kützing, Synedra arcus Kützing, their morphology, types and nomenclature Diatom Research 34(4): 237-250, 55 figs., 2 tables |