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Two new Cocconeis taxa (Bacillariophyceae) from coral sands off the Mascarenes (Western Indian Ocean) and some related unidentified taxa
Riaux-Gobin, C.; Romero, O.E.; Al-Handal, A.Y.; Compère, P. (2010). Two new Cocconeis taxa (Bacillariophyceae) from coral sands off the Mascarenes (Western Indian Ocean) and some related unidentified taxa. Eur. J. Phycol. 45(3): 278-292. dx.doi.org/10.1080/09670260903560076
In: European Journal of Phycology. Cambridge University Press/Taylor & Francis: Cambridge. ISSN 0967-0262; e-ISSN 1469-4433, meer
Peer reviewed article  

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Trefwoorden
    Bacillariophyceae [WoRMS]; Cocconeis C.G. Ehrenberg, 1837 [WoRMS]; Marien
Author keywords
    Cocconeis; coral sands; diatoms; fringing reefs; Mascarenes; Indian

Auteurs  Top 
  • Riaux-Gobin, C.
  • Romero, O.E.
  • Al-Handal, A.Y.
  • Compère, P.

Abstract
    Coral sands off Reunion Island and Rodrigues (Mascarene archipelago, Western Indian Ocean) support diverse diatom communities, particularly rich in Monoraphidineae. Recent surveys of reef environments (June 2005 and June 2007) permitted the recognition of several taxa belonging to the diatom genus Cocconeis, among which are two new, relatively small taxa, cpipsammic on coral sand. Cocconeis coronata Riaux-Gobin et Romero sp. nov. is similar to C. scutellum but has its own distinctive features. In external view, the concave raphe valve possesses uniseriate striae and a subsident hyaline marginal rim, while the strongly convex sternum valve has a submarginal, generally continuous crest, a hexagonal pattern of areolation, short, rounded spines that are often regularly arranged around valve face areolae, a complex areola hymen and small marginal chambers. Some morphometric differences were noted between the populations of C. coronata at Reunion and Rodrigues. Cocconeis margaritata Riaux-Gobin et Al-Handal, sp. nov. is smaller, possesses a sternum valve like that of C. placentula and C. neothumensis, but has denser striation and small pearl-like concretions around the areola aperture on the sternum valve. Several other taxa that resemble, or may be varieties of, C. margaritata require further study before being formally described. Cocconeis margaritata and C. coronata are small and relatively rare, so their study requires scanning electron microscopy.

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