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Mol Phylogenet Evol. 2018 Mar;120:196-211. doi: 10.1016/j.ympev.2017.12.009. Epub 2017 Dec 13.

Neolyngbya gen. nov. (Cyanobacteria, Oscillatoriaceae): A new filamentous benthic marine taxon widely distributed along the Brazilian coast.

Author information

1
Programa de Pós-Graduação em Botânica, Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Universitária, CEP 44031-460, Feira de Santana, Bahia, Brazil; Laboratório de Algas Marinhas (LAMAR), Departamento de Botânica, Instituto de Biologia, Campus de Ondina, Universidade Federal da Bahia, CEP 40210-730, Salvador, Bahia, Brazil. Electronic address: taiaracaires@gmail.com.
2
Laboratório de Algas Marinhas (LAMAR), Departamento de Botânica, Instituto de Biologia, Campus de Ondina, Universidade Federal da Bahia, CEP 40210-730, Salvador, Bahia, Brazil.
3
Universidade Luterana do Brasil (ULBRA) - Cachoeira do Sul, Rua Martinho Lutero, 301, Bairro Universitário, CEP 96501-595, Cachoeira do Sul, Rio Grande do Sul, Brazil.
4
Universidade do Estado do Rio de Janeiro (UERJ), Laboratório de Ficologia e Educação Ambiental (Lafea), Pavilhão Haroldo Lisboa da Cunha, Maracanã, CEP 20551-220, Rio de Janeiro, RJ, Brazil.
5
Instituto de Botânica, Núcleo de Pesquisa em Ficologia, Av. Miguel Estéfano, CEP 04301-902, São Paulo, SP, Brazil.

Abstract

Brazil has an extensive and environmentally diverse coastline, which favors the occurrence of numerous cyanobacterial morpho- and ecotypes. Nevertheless, this coastline is still poorly studied and its diversity is underestimated. Considering the family Oscillatoriaceae, Lyngbya deserves special attention. It includes many clades which are phylogenetically non-related but morphologically similar. Such clades occur in marine and freshwater environments and are traditionally treated as a single genus. In the current study, we sampled both mediolittoral and estuarine zones along the Brazilian coast. Based on a polyphasic characterization, we described a new genus of marine filamentous cyanobacteria: Neolyngbya. It includes six new species sampled in Brazil, which are described in this study (N. maris-brasilis, N. granulosa, N. irregularis, N. nodulosa, N. arenicola and N. tenuis). Additionally, the characterization included a Neolyngbya sp. from Japan in the clade, but only based on molecular data. All species presented irregular arrangement of thylakoids as described for Oscillatoriaceae. The new genus shares morphological characteristics with species in different clades of the Lyngbya complex. The ultrastructural analyses of Neolyngbya, however, showed numerous gas vesicles, especially in the interthylakoid space; such feature is not observed in benthic Lyngbya species. Neolyngbya formed a well-supported clade (16S rRNA phylogeny), however distantly related to L. aestuarii and L. confervoides, both marine species clusters. The Limnoraphis clade is in a sister relationship to the Neolyngbya clade, however the former occurs in freshwater plankton. Secondary structures of 16S-23S rRNA ITS sequences were congruent with the phylogeny. The polyphasic characterization was helpful to clarify the diversity and ecological aspects of benthic filamentous cyanobacteria and the evolutionary history of the group. This favors a better understanding of inter and infrageneric taxa. The number of novel taxa described in this study emphasizes the importance of conducting additional floristic surveys, mainly in underexplored marine environments, to reveal the real cyanobacterial biodiversity in these areas.

KEYWORDS:

16S rRNA; Biodiversity; Coastal environments; Cyanobacteria; Polyphasic approach

PMID:
29246815
DOI:
10.1016/j.ympev.2017.12.009
[Indexed for MEDLINE]

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