Abstract
Light microscope (LM) observations of specimens of Rhopalodia constricta (W.Smith) Krammer are made from the holotype slide. LM and scanning electron microscope (SEM) observations from Rabenhorst’s material of this species are also presented. The two populations are similar in size and ornamentation. Many features seen in the SEM are presented here for the first time, including documentation of the valve interior and the girdle bands. A flap from the valvocopula extends onto the valve exterior at the apices and covers the raphe end-this is the first time this feature has been documented in the Rhopalodiales. Rhopalodia constricta is compared and contrasted with other, small species of the genus. It lacks features seen in the generitype, R. gibba, suggesting it might be phylogenetically dissimilar to the type species of the genus.
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