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<title lang=en>Cocconeis Ehrenberg taxa (Bacillariophyta) with a marginal row of simple processes: relationship with the valvocopula system and distinctive features of related taxa</title>
<creator>Riaux-Gobin, Catherine</creator>
<creator>Witkowski, Andrzej</creator>
<creator>Compère, Pierre</creator>
<creator>Romero, Oscar E.</creator>
<contributor>Centre de recherches insulaires et observatoire de l'environnement (CRIOBE) ; Université de Perpignan Via Domitia (UPVD) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire d'Excellence CORAIL (LabEX CORAIL) ; Institut de Recherche pour le Développement (IRD) - Université des Antilles et de la Guyane (UAG) - École des hautes études en sciences sociales (EHESS) - École pratique des hautes études (EPHE) - Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) - Université de la Réunion (UR) - Université de la Polynésie Française (UPF) - Université de Nouvelle Calédonie - Institut d'écologie et environnement</contributor>
<contributor>lnstitute of Marine Sciences and Coastal Research ; University of Szczecin</contributor>
<contributor>Botanic Garden Meise</contributor>
<contributor>MARUM ; University of Bremen</contributor>
<description>International audience</description>
<source>ISSN: 1802-5439</source>
<source>EISSN: 1805-4927</source>
<source>Fottea (Praha)</source>
<publisher>Czech Phycological Society</publisher>
<identifier>hal-01212883</identifier>
<identifier>https://hal-univ-perp.archives-ouvertes.fr/hal-01212883</identifier>
<identifier>https://hal-univ-perp.archives-ouvertes.fr/hal-01212883/document</identifier>
<identifier>https://hal-univ-perp.archives-ouvertes.fr/hal-01212883/file/fottea_fot-201502-0003.pdf</identifier>
<source>https://hal-univ-perp.archives-ouvertes.fr/hal-01212883</source>
<source>Fottea (Praha), Czech Phycological Society, 2015, 15 (2), pp.139-154. 〈10.5507/fot.2015.015〉</source>
<identifier>DOI : 10.5507/fot.2015.015</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.5507/fot.2015.015</relation>
<language>en</language>
<subject lang=en>Achnanthales</subject>
<subject lang=en>Cocconeis</subject>
<subject lang=en>marginal processes</subject>
<subject lang=en>taxonomy</subject>
<subject lang=en>morphology</subject>
<subject>[SDE.BE] Environmental Sciences/Biodiversity and Ecology</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>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. Abbreviations: (LM) light microscope, (SEM) scanning electron microscope, (RV) raphe valve, (SV) sternum valve, (RVVC) raphe valve valvocopula, (SVVC) sternum valve valvocopula</description>
<date>2015</date>
</dc>
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