A preliminary investigation of the order Bangiales (Bangiophycidae, Rhodophyta) based on sequences of nuclear small‐subunit ribosomal RNA genes

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<jats:title>SUMMARY</jats:title><jats:p>We investigated phylogenetic relationships among red algae of the order Bangiales by analysis of sequences of the nuclear gene encoding cytosolic small‐subunit ribosomal RNA in <jats:italic>Bangia atropurpurea</jats:italic> (Roth) C. Ag. and eight samples representing seven species of <jats:italic>Porphyra.</jats:italic> The ssu‐rDNA range from 1818 to 1845 nucleotides in length, with guanosine plus cytosine ratios between 47.0% and 48.6%. A group IC1 intron occurs in the <jats:italic>B atropurpurea</jats:italic> ssu‐rDNAs at the same position as in <jats:italic>P. spiralis var. amplifolia</jats:italic> Oliveira Filho et Coll and several other eukaryote ssu‐rDNAs. The nine sequences form a stable monophyletic group upon phylogenetic analysis. The ssu‐rDNA from <jats:italic>B. atropurpurea</jats:italic> nests stably within the <jats:italic>Porphyra</jats:italic> group and is closely related to <jats:italic>P. amplissima</jats:italic> (Kjellm.) Setchell et Hus in Hus, making the genus <jats:italic>Porphyra</jats:italic> paraphyletic. No correlation is seen between phylogenetic position and number of cell layers in the <jats:italic>Porphyra</jats:italic> thallus. We discuss possible taxonomic and evolutionary implications of these observations.</jats:p>

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