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 referenceHomann, M. (1991). Die Diatomeen der Fur-Formation (Alttertiar) aus dem Limfjord-Gebiet, Nordjutland/Danemark. Geologisches Jahrbuch, Reihe A,, 123: 3-285 page(s): p. 69; pl. 35, fig. 1-8, 11-13 [details]