Basionym: Cymbella delicatula var. costei Lange-Bertalot & Moser in Moser et al., Biblioth. Diatomol. 32: 68, pl.
22: figs. 9-14, 1995. Latin diagnosis in Maillard 1978, p. 159 (as “Cymbella costei Maillard” 1978, inval.). Invalid designation: “Cymbopleura costei Krammer & Lange-Bertalot” 1998, inval. “Delicata costei Krammer & Lange-Bertalot,” inval. in Krammer Diatoms of Europe:
118; pl. 135, figs 6, 7, 2003.