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Henri Van Heurck examined a sample collection of sea ice and underlying sea floor sediment material during the Belgian Antarctic Expedition (1897–1899). He described eight new taxa of the monoraphid diatom genus  Cocconeis  from this collection including:  C .  antiqua  var.  tenuistriata ,  C .  gautierii  var.  gautierii  and var.  inornata ,  C .  heydrichii ,  C .  japonica  var.  antarctica ,  C .  litigiosa ,  C .  schuettii  var.  schuettii  and var.  minor . All these  Cocconeis  taxa share well-silicified sternum valves with wide, apical hyaline areas, more or less lenticular in shape, and narrow hyaline bands at mid-distance between the apical axis and the margin, while the more delicate raphe-sternum valves bear uniseriate striae, a hemistauros associated with the central raphe area, and crescent-shaped terminal hyaline areas. Since their original description in the early 20th century, these  Cocconeis  taxa have been rarely reported. I studied newly described  Cocconeis  taxa from Van Heurck's type material by light microscopy. The main valve features of  C. gautierii  var.  gautierii  and var . inornata ,  C. litigiosa , and  C. schuettii  var.  schuettii  and var.  minor  agree well with those of  Cocconeis antiqua ; I propose these five taxa be reduced to synonymy of  C. antiqua .

Morphological study of the genus Cocconeis Ehrenberg (Bacillariophyceae) collected during the 1897–1899 Belgian Antarctic Expedition