Fottea 2018, 18(1):86-105 | DOI: 10.5507/fot.2017.018

Nunduva, a new marine genus of Rivulariaceae (Nostocales, Cyanobacteria) from marine rocky shores

Laura González-Resendiz*1, Jeffrey R. Johansen2,3, Luisa Alba-Lois4, Claudia Segal-Kischinevzky4, Viviana Escobar-Sánchez4, Luis F. Jimenez Garcia4, Tomá¹ Hauer3,5, Hilda León-Tejera1
1 Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México (UNAM). Coyoacán, Código Postal 04510, Ciudad de México México; *Corresponding author e-mail: mlauragonzalez@ciencias.unam.mx
2 Department of Biology, John Carroll University, University Heights, Ohio, 44118 USA
3 Department of Botany, Faculty of Science, University of South Bohemia, Brani¹ovská 1760, 370 05 Èeské Budìjovice, Czech Republic
4 Departamento de Biología Celular, Facultad de Ciencias, UNAM, Ciudad de México, México
5 Centre for Phycology, Institute of Botany AS CR, Dukelská 135, 379 82 Tøeboò, Czech Republic

Several populations of a non-tapering and tapering, fasciculated, single and geminate false branching heterocytous cyanobacterium were collected from rocky shores in the Pacific Ocean and Gulf of Mexico. The populations were provisionally placed in Brasilonema based on morphology, but upon sequencing of both environmental and culture material it was discovered that the populations/cultures belonged to the Rivulariaceae, in a marine subclade of the family containing Kyrtuthrix huatulcensis. In culture, the taxon exhibited tapering in isopolar filaments, providing further evidence that it was a member of the rivulariacean clade. Based on molecular data for other cyanobacteria within the rivulariacean clade, we identified at least three more species morphologically distinguishable from the Brasilonema-like material, all of which show more pronounced tapering. These cyanobacteria include not only tropical marine strains, but also a strain isolated from the English coastline in the Atlantic Ocean. We propose a new genus and four species for members of this distinctive clade, Nunduva fasciculata gen. nov., sp. nov., N. kania sp. nov., N. biania sp. nov., and N. britannica sp. nov. Other strains that others and we have isolated are sister to Nunduva and may eventually be placed within this genus, but at present, we consider the evidence for inclusion in Nunduva to be insufficient.

Keywords: 16S rRNA gene, 16S-23S ITS region, Calothrix, geminate branching, intertidal, isopolar growth, marine, Nostocales, Rivulariaceae, Gulf of México, Pacific, Atlantic, European

Received: February 28, 2017; Accepted: August 24, 2017; Prepublished online: February 27, 2018; Published: March 31, 2018Show citation

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González-Resendiz, L., Johansen, J.R., Alba-Lois, L., Segal-Kischinevzky, C., Escobar-Sánchez, V., Jimenez Garcia, L.F., Hauer, T., & León-Tejera, H. (2018). Nunduva, a new marine genus of Rivulariaceae (Nostocales, Cyanobacteria) from marine rocky shores. Fottea, 18(1), 86-105. doi: 10.5507/fot.2017.018
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