Komvophoron kgariisp. nov. (Oscillatoriales), a new epipelic cyanobacterium from subtropical eastern Australia

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Abstract
A new epipelic freshwater cyanobacterium, Komvophoron kgarii sp. nov., was identified from a perennial wallum stream on Fraser Island, northeastern Australia. Komvophoron kgarii was the first species in Komvophoron that was described on the basis of combined morphological, ultrastructural and phylogenetic attributes. The new taxon was distinguished by virtue of its obtuse-conical apical cells that became conically elongated and narrowed toward the ends as they matured. Additionally, trichome separation into hormogonia was preceded by preapical cells beginning to differentiate on either side of the fragmentation point before separation, a feature not previously recorded in this genus. Ultrastructural examination showed that thylakoids formed irregularly arranged blocks of lamellae in both longitudinal and cross-sections. Phylogenetic analysis revealed that the isolated material shared less than 91% 16S ribosomal RNA nucleotide sequence similarity with any other cyanobacterial sequence and formed a novel branch.

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