title: COLEOFASCICULUS GEN. NOV. (CYANOBACTERIA): MORPHOLOGICAL AND MOLECULAR CRITERIA FOR REVISION OF THE GENUS MICROCOLEUS GOMONT(1).
abstract: Species currently classified within the cyanobacterial genus Microcoleus were determined to fall into two distinct clades in a 16S rDNA phylogeny, one containing taxa within the Oscillatoriaceae, the other containing taxa within the Phormidiaceae. The two lineages were confirmed in an analysis of the 16S-23S internal transcribed spacer (ITS) region sequences and secondary structures. The type species for Microcoleus is M. vaginatus Gomont, and this taxon belongs in the Oscillatoriaceae. Consequently, Microcoleus taxa in the Phormidiaceae must be placed in separate genera, and we propose the new genus Coleofasciculus to contain marine taxa currently placed in Microcoleus. The type species for Coleofasciculus is the well-studied and widespread marine mat-forming species Microcoleus chthonoplastes (Mert.) Zanardini ex Gomont. Other characters separating the two families include type of cell division and thylakoid structure.
authors.affiliation: Experimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, GermanyDepartment of Biology, John Carroll University, University Heights, Ohio 44118, USAUniversität Rostock, Institut für Biologische Wissenschaften, Albert-Einstein-Strasse 3, 18057 Rostock, GermanyExperimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany.
authors.forename: Maria A
authors.initials: MA
authors.lastname: Siegesmund
authors.affiliation: Experimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, GermanyDepartment of Biology, John Carroll University, University Heights, Ohio 44118, USAUniversität Rostock, Institut für Biologische Wissenschaften, Albert-Einstein-Strasse 3, 18057 Rostock, GermanyExperimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany.
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Johansen
authors.affiliation: Experimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, GermanyDepartment of Biology, John Carroll University, University Heights, Ohio 44118, USAUniversität Rostock, Institut für Biologische Wissenschaften, Albert-Einstein-Strasse 3, 18057 Rostock, GermanyExperimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany.
authors.forename: Ulf
authors.initials: U
authors.lastname: Karsten
authors.affiliation: Experimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, GermanyDepartment of Biology, John Carroll University, University Heights, Ohio 44118, USAUniversität Rostock, Institut für Biologische Wissenschaften, Albert-Einstein-Strasse 3, 18057 Rostock, GermanyExperimental Phycology and Culture Collection of Algae, Georg-August University Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Friedl
keywords: 16S-23S internal transcribed spacer; ITS rRNA secondary structure; Microcoleus; cyanobacteria; morphology; phylogeny; taxonomy