期刊
JOURNAL OF PHYCOLOGY
卷 53, 期 5, 页码 1097-1105出版社
WILEY
DOI: 10.1111/jpy.12568
关键词
16S rRNA; 16S-23S ITS; Brazil; cryptic taxa; morphological evaluation; phylogenetic analysis; taxonomy
资金
- Sao Paulo Research Foundation [FAPESP 2010/09686-4, 2012/19468-0, 2013/08207-3, 2014/08200-1]
- CAPES Brazilian Federal Agency for Support and Evaluation of Graduate Education within the Ministry of Education of Brazil
Several new genera originally classified as the genus Phormidium, a polyphyletic and taxonomically complex genus within the Oscillatoriales, were recently described. The simple morphology of Phormidium does not reflect its genetic diversity and the delimitation of a natural group is not possible with traditional classification systems based on morphology alone. Therefore, this study used morphological, ecological, and molecular approaches to evaluate four populations morphologically similar to Ammassolinea, Kamptonema, and Ancylothrix (simple, curved, and gradually attenuated at the ends trichome), found in subtropical and tropical Brazilian regions. 16S rRNA gene sequences grouped all the strains in a highly supported clade with other two European strains isolated from thermal springs surrounding areas. The 16S-23S ITS secondary structure corroborated the phylogenetic analysis withall the strains having similar structures. Consequently, a genetically well-defined and crypticnew genus, Koinonema gen. nov., is proposedcontaining the aquatic, mesophilic, and morphologically homogeneous new species, Koinonema pervagatum sp. nov.
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