original description(ofPyxilla dubia Grunow in Van Heurck, 1882)Cleve, P. T.; Möller, J. D. (1878). Diatoms. Part III, No. 109-168. <em>Esatas Edquists Boktryckeri, Upsala.</em> page(s): No. 166 [details]
original description(ofPyxilla dubia Grunow in Van Heurck, 1882)Van Heurck, H. (1880). Synopsis des Diatomées de Belgique. Atlas. <em>Ducaju & Cie., Anvers.</em> page(s): pl. 83, figs. 7, 8 [details]
new combination referenceForti, A. (1909). Studi per una Monagrafia del genere Pyxilla (Diatomee) e dei generi affini. Nuova Notarisia, 20: 19-34, 2 pls page(s): p. 28; pl. 1, fig. 1-3 [details]