Abstract
Type material of Melosira sculpta (Ehrenberg) Kützing from the Ehrenberg Collection was studied using light (LM) and scanning electron (SEM) microscopy. Comparison with Pseudoaulacosira moisseeviae (Lupikina in Brattseva et al.) Lupikina & Khursevich showed that they have very similar valve morphologies and should both belong to Pseudoaulacosira Lupikina & Khursevich. However, the species differ morphologically in several characters and so a new combination, Pseudoaulacosira sculpta (Ehrenberg) Usoltseva & Houk comb. nov. is proposed. Morphological and ultra-morphological features of this species are presented and discussed, including the presence of a septum.
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