A small marine monoraphid diatom with a linear-elliptic shape and simple terminal raphe endings was present on Raivavae (South Pacific). Particularly due to its different stria structure on both valves, this taxon is here classified as Cocconeis. The new species was present on the rocky intertidal shore of the coral-reef lagoon, as an epiphyte on a turf. Cocconeis vaiamanuensis sp. nov. can be compared to some other monoraphids with a simple raphe system and a rod-like shape. The new taxon has small marginal processes on the sternum valve (SV) mantle, as previously reported for Cocconeis peltoides. Such processes were also previously observed in Platessa and Psammothidium. A cladistic analysis based on ultrastructure shows an affiliation between several close-by taxa. Cocconeis of the C. peltoides section are close to Psammothidium, whereas other Cocconeis without processes are closer to Platessa and Achnanthidium. A clone of Cocconeis cf. sigillata (SZCZCH1200) allowed for a molecular phylogeny to be reconstructed. The molecular signature of Cocconeis cf. sigillata is close to that of Lemnicola hungarica. Cocconeis is a genus with different and complex morphologies that may be split into independent clades (genera). The SV processes may be a vestigial character reminiscent of an ancestral state.

Raivavae（南太平洋）上有一个小型的海洋独脚架硅藻，它具有线性椭圆形的形状和简单的末端网状结局。特别是由于两个阀门上的条纹结构不同，此分类单元在这里被归类为“ Cocconis”。这些新物种作为草皮上的附生植物存在于珊瑚礁泻湖的岩石潮间带。瓦科球藻属（Cocconeis vaiamanuensis sp。）十一月 可以与其他具有简单光栅系统和杆状形状的独脚架进行比较。新的分类单元在胸骨瓣（SV）地幔上具有较小的边缘过程，如先前报道的关于球藻的球果。先前在Platessa和Psammothidium中也观察到了这种过程。基于超微结构的分类分析显示了几个附近的分类单元之间的联系。peloides切面的球菌较靠近沙门氏菌，而没有突触的其他球果较近于Platessa和Achnanthidium。球藻的克隆cf. sigillata（SZCZCH1200）允许重建分子系统发育。球藻的分子标志比较。锡吉拉塔（Sigillata）接近匈牙利的Lemnicola hungarica。球菌属是具有不同和复杂形态的属，可以分为独立的进化枝（属）。SV过程可能是让人联想起祖先状态的残余特征。