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We present a taxonomical revision of  Cocconeis distans  and  C. debesi  based on historical collections from Hustedt, and live material sampled from leaves of  Posidonia oceanica . Our observations clarify the specific morphology of the two taxa, which have been confused by past and modern authors. In addition, we demonstrate that the valve structure of  C. debesi  deviates from that of the genus  Cocconeis , but agrees with that of the genus  Amphicocconeis . Therefore, we propose a new nomenclatural combination,  Amphicocconeis debesi . The study also provides additional information on the geographical distribution of these taxa.

Cocconeis distans Gregory and Amphicocconeis debesi (Hustedt) De Stefano comb. nov. (Bacillariophyta), an intricate taxonomical history