original description(ofGomphonema pseudoexiguum Simonsen, 1959)Simonsen, R. (1959). Neue Diatomeen aus der Ostsee. I. Kieler Meeresforschungen, 15: 74-83, 3 pls. page(s): p. 83; pl. 12, fig. 8-9 [details]
basis of recordHällfors, G. (2004). Checklist of Baltic Sea Phytoplankton Species (including some heterotrophic protistan groups). <em>Baltic Sea Environment Proceedings.</em> No. 95: 210 pp., available online athttp://helcom.fi/Lists/Publications/BSEP95.pdf[details] Available for editors [request]