Van de Vijver, B.; Riaux-Gobin, C.; Compère, P. (2009). Morphological observations on Vikingea gibbocalyx (Brun) Witkowski, Lange-Bertalot & Metzeltin (Bacillariophyta). Nova Hedwigia 89(1-2): 263-279. http://dx.doi.org/10.1127/0029-5035/2009/0089-0263
In: Nova Hedwigia. Borntraeger Gebrüder: Berlin; Stuttgart. ISSN 0029-5035, meer
Light (LM) and scanning electron (SEM) microscope observations of Vikingea gibbocalyx (Brun) Witkowski, Lange-Bertalot et Metzeltin, from coral sands off Réunion (Indian Ocean), are presented. The species is illustrated with a particular focus on new, or previously poorly documented, morphological details such as the raised external ridges, the structure of the girdle and the structure of the areolae with typical disc-like coverings. In the middle of the valve, near the margin, two central-marginal circular structures are observed. The fine architecture of the central-marginal circular structures and the areolae are examined. The biogeography of the taxon is discussed taking into account all observations in the literature.
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