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We present an ultrastructure-based revision (using light and electron microscopy) of the type species of the genus  Cocconeis ,  C. scutellum  var.  scutellum , and four often-mentioned but poorly described, morphologically related varieties:  C. scutellum  var.  baldjikiana ,  C. scutellum  var. c linoraphis ,  C. scutellum  var.  parva ,  C. scutellum  var.  posidoniae . In addition, we introduce three new taxa,  C. scutellum  var.  gorensis  var. nov.,  C. scutellum  var.  posidoniae  f.  decussata  f. nov. and  C. scutellum  var.  sullivanensis  var. nov. The taxonomic relationships between these varieties and the remaining validly described  C. scutellum  varieties are analyzed on the basis of their ultrastructural differences. We also provide additional information on the geographical distribution of all analyzed  C. scutellum  taxa.

A comparative study of Cocconeis scutellum Ehrenberg and its varieties (Bacillariophyta)