original description(ofAchnanthes bicapitata Hustedt, 1952)Hustedt, F. (1952). Neue und wenig bekannte Diatomeen. IV. Botaniska Notiser, 1952: 366-410 page(s): p. 386; fig. 68-71 [details]
new combination referenceTremarin, P. I.; Straube, A.; Ludwig, T. A. V. (2015). Nupela (Bacillariophyceae) in littoral rivers from south Brazil, and description of six new species of the genus. <em>Fottea.</em> 15(1): 77-93., available online athttps://doi.org/10.5507/fot.2015.007 page(s): 78, 80; note: figs. 13-22 [details] Available for editors [request]
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