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The marine microfilamentous green algal genus Okellya Leliaert & Rueness forms a distinct lineage of Cladophorales Haeckel, and currently contains only a single species, Okellya curvata (Printz) Leliaert & Rueness, originally described as Uronema curvatum Printz from Norway. Based on phylogenetic analyses of SSU and LSU rDNA sequences, we show that the Australian Uronema marinum Womersley also belongs to Okellya, and the species is transferred there as O. marina (Womersley) Wetherbee, comb. nov. We provide detailed observations of cultured material and show that O. marina (Womersley) Wetherbee, comb. nov. differs from O. curvata in the presence of pyrenoids, necessitating a revised circumscription of the genus Okellya and family Okellyaceae Leliaert & Rueness.
Les données moléculaires et l'observation des cultures montrent que l'algue verte microfilamenteuse marine Uronema marinum Womersley est membre du genre Okellya Leliaert & Rueness (Cladophorales, Chlorophyta).
Le genre d'algue verte microfilamenteuse marine Okellya Leliaert & Rueness forme une lignée distincte des Cladophorales Haeckel, et contient actuellement une seule espèce, Okellya curvata (Printz) Leliaert & Rueness, originellement décrite comme Uronema curvatum Printz en Norvège. Sur la base d'analyses phylogénétiques des séquences SSU et LSU rDNA, nous montrons que l'espèce australienne Uronema marinum Womersley appartient aussi à Okellya, et l'espèce est transférée comme O. marina (Womersley) Wetherbee, comb. nov. Nous fournissons des observations détaillées de matériel en culture et montrons que O. marina (Womersley) Wetherbee, comb. nov. diffère de O. curvata dans la présence de pyrénoïdes, appelant une délimitation révisée du genre Okellya et de la famille Okellyaceae Leliaert & Rueness.
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