Fragilaria odeloucaensis sp. nov. (Bacillariophyta, Fragilariaceae) a diatom from temporary streams in southern Portugal

A new species of araphid diatom is described from a temporary stream in southern Portugal, Fragilaria odeloucaensis sp. nov., which belongs to the group with widely linear lanceolate valve outline, spaced striae, lacking spines, and well-developed apical pore fields. The taxon can be distinguished based on five unique features within this group, valves capitate apices, zig-zagged axial area, central area squared fascia, fields clearly sunken into apices heterovalvar frustules (with respect striae distancing). Ecological type locality an additional sampling point where was found are given, together discussion taxonomic position Fragilaria, approach used herein for identification diagnostic features. This includes detailed analysis internal external characteristics area-virgae-striae complex, differences among same frustule, addition traditional shape morphometric