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Phytoplankton samples were taken along the Tunisian coasts and especially in the Bay of Tunis in the southwestern Mediterranean Sea. Here we report the ultrastructure and the spatio-temporal distribution of two new records for the diatom flora of the Mediterranean Sea:  Bellerochea horologicalis  and  Lithodesmioides polymorpha  var.  tunisiense  var. nov. The new variety can be distinguished from the nominate variety by such morphological features as valve shape, striae density on valve face and mantle, and fine structure of the areolae occlusions. Both diatom taxa are present year-round in the Bay of Tunis, but are most abundant in its southwestern region. They appear to be associated with waters characterised by high turbidity and high nutrient levels. In this region of the Bay of Tunis, both diatom taxa are presented alive in the sediment up to 14 cm deep.  B. horologicalis  is also present in the Bay of Sousse, whereas  L .  polymorpha  var.  tunisiense  also occurs in the Gulf of Gabès.

botanica marina

Bellerochea horologicalis  and  Lithodesmioides polymorpha  var.  tunisiense  var. nov. (Coscinodiscophyceae, Bacillariophyta) in the Bay of Tunis: ultrastructural observations and spatio-temporal distribution