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Benthic marine diatoms from tropical environments are still poorly documented, despite their high diversity. Coral reef biotopes of the Mascarene Islands (Western Indian Ocean Archipelago: Reunion, Mauritius, Rodrigues Islands) provide the opportunity to study a large part of their diatom community: the abundant small-sized Achnanthales treated here. Diatoms of other environments of very variable nutrient status were studied in R#union and Rodrigues Islands and include areas of both low and high anthropogenic impact.
This monograph describes taxa of seven genera, upon which Cocconeis Ehrenberg was particularly diverse. Scanning and light microscope images document and illustrate a total of 59 taxa, eight of them are new descriptions from these islands. This study serves as a basis for further investigations in the Mascarenes, Reunion the Rodrigues Islands and other tropical areas.
The Mascarenes 5
Diversity of coral reef diatoms 7
Preliminary remarks 8
Material and methods 8
Order Achnanthales Silva 11
New taxa described 12
Taxa description 13
Taxa with unfixed classification 40
General comments about the Mascarene small-sized Achnanthales 43
New taxa and endemism in Mascarenes 44
Characteristics shared by taxa close or affiliated to Cocconeis peltoides 46
Small-sized taxa and the importance of SEM observations 47
LM Plates 56
SEM Plates 70
Taxonomic Index 232
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