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The study of coral reef diatoms on Moorea Island in the Society Archipelago, South Pacific Ocean revealed a strong representation of the Achnanthales, with many taxa of  Cocconeis . One of these  Cocconeis , examined by light and scanning electron microscopy, shows a sternum valve (SV) with a close resemblance to the  Cocconeis scutellum  lineage, whereas the raphe valve (RV) and the valvocopula system are different from that of  C .  scutellum , therefore a new name has been given to it,  Cocconeis spina-christi  sp. nov. This new taxon has several remarkable features: 1) the RV stria density is, on average, twice as high as that of the SV; 2) the RV valvocopula extended and structurally complex, has large marginal fenestrae, irregular digitiform fimbriae and one longer spine-like fimbria at each apex; and 3) an anchor system between the valvocopula of each valve is observed, consisting of a rounded papilla with transverse furrows lying on each basal RV valvocopula fimbria and fitting into a rounded concavity – or cupule – in the corresponding marginal edge of the SV valvocopula. Such an anchor system between valvocopulae seems a characteristic common to several  Cocconeis  species bearing fimbriae on each valvocopula. The definition and limit of the concept of varieties in the  C. scutellum  lineage is also addressed.

botanica marina

A new  Cocconeis  (Bacillariophyceae) from Moorea Island, Society Archipelago, South Pacific Ocean with distinctive valvocopula morphology and linking system