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In the historical Grunow collection in Vienna, a piece of a broken slide covered with mica contained diatom material from Porto Subzanski, a coastal environment in Croatia. This material was examined in scanning electron microscopy. Several poorly documented or improperly assigned taxa within the Achnanthales, namely in  Amphicocconeis  and  Cocconeis , were re-examined. A new combination of  Amphicocconeis  and a new species of  Cocconeis  are proposed. The new species,  Cocconeis subzanskiensis , is closely related to  Cocconeis placentula , except for the lack of a characteristic hyaline sub-marginal rim on the raphe valve, and is compared with other marine taxa pertaining to the same group. Recently described in tropical environments,  Cocconeis coronatoides  has been found in the Grunow material.

Achnanthales from historical Grunow collection in Porto Subzanski, Croatia