WETZEL, C. E., and L. ECTOR. “<em>Planothidium Lagerheimii Comb. nov.</Em> (Bacillariophyta, Achnanthales) a Forgotten Diatom from South America”. Phytotaxa, vol. 188, no. 5, Dec. 2014, pp. 261–267, doi:10.11646/phytotaxa.188.5.3.