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Cocconeis Ehrenberg taxa (Bacillariophyta) with a marginal row of simple processes: relationship with the valvocopula system and distinctive features of related taxa
Riaux-Gobin, C.; Witkowski, A.; Compère, P.; Romero, O. (2015). Cocconeis Ehrenberg taxa (Bacillariophyta) with a marginal row of simple processes: relationship with the valvocopula system and distinctive features of related taxa. Fottea 15(2): 139-154. dx.doi.org/10.5507/fot.2015.015
In: Fottea. ISSN 1802-5439, more
Peer reviewed article  

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Keywords
    Achnanthales [WoRMS]; Cocconeis C.G. Ehrenberg, 1837 [WoRMS]; Marine
Author keywords
    Achnanthales; Cocconeis; marginal processes; taxonomy; morphology

Authors  Top 
  • Riaux-Gobin, C.
  • Witkowski, A.
  • Compère, P., more
  • Romero, O.

Abstract
    As first observed on a group of taxa related to Cocconeis peltoides Hustedt, several other Cocconeis Ehrenberg (Bacillariophyta) taxa possess a row of minute marginal pores on the external side of their sternum valve (SV) connected to small and simple internal portules, or processes. These processes are often located in continuity with the striae, but can also be slightly shifted or distant from the distal areola of the striae. The row of pores is often, but not always, externally separated from the stria by a crista marginalis. Within Cocconeis, and possibly all raphid diatoms, these processes seem unique and restricted to a few taxa. A list is presented of the taxa pertaining (or close) to Cocconeis that are actually known to share these micro-structures. In addition, the morphological variability of the processes is described in detail and a morphological comparison of the taxa is provided. The characteristic features of taxa showing a row of SV processes permit the tentative definition of several morphological groups. It is difficult to prove the taxonomic affiliation of these taxa and demonstrate or refute that these processes are ancestral characters. Some of these taxa are rare and restricted to low latitudes (e.g., tropical taxa) while others are frequent and ubiquitous.

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