Revision of the Synechococcales (Cyanobacteria) through recognition of four families including Oculatellaceae fam. nov. and Trichocoleaceae fam. nov. and six new genera containing 14 species

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A population of Desertifilum (Cyanobacteria, Oscillatoriales) from an oligotrophic desertic biotope was isolated and characterized using a polyphasic approach including molecular, morphological, and ecological information. The population was initially assumed to be a new species based on ecological and biogeographic separation from other existing species, however, phylogenetic analyses based on sequences of the 16S rRNA gene and 16S–23S ITS region, placed this strain clearly within the type species, Desertifilum tharense. Comparative analysis of morphology, 16S rRNA gene similarity, 16S–23S ITS secondary structure, and percent dissimilarity of the ITS regions for all characterized strains supports placing the six Desertifilum strains (designated as PD2001/TDC17, UAM‐C/S02, CHAB7200, NapGTcm17, IPPAS B‐1220, and PMC 872.14) into D. tharense. The recognition of Desertifilum salkalinema and Desertifilum dzianense is not supported, although our analysis does support continued recognition of Desertifilum fontinale. Pragmatic criteria for recognition of closely related species are proposed based on this study and others, and more rigorous review of future taxonomic papers is recommended.

“…, Mai et al. ). It is possibly ironic that we are the ones to propose that the partitioning of the cyanobacterial genus Desertifilum into four cryptic species has gone too far.…”

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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A bridge too far in naming species: a total evidence approach does not support recognition of four species in Desertifilum (Cyanobacteria)

González-Resendiz

Johansen

León‐Tejera

et al. 2019

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“…, Mai et al. ), sequences assigned to several Leptolyngbya morphospecies still place outside Leptolyngbya sensu stricto (Osorio‐Santos et al. , Becerra‐Absalon et al.…”

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confidence: 99%

When Is A Lineage A Species? A Case Study In Myxacorys gen. nov. (Synechococcales: Cyanobacteria) With The Description of Two New Species From The Americas

Pietrasiak

Osorio‐Santos

Shalygin

et al. 2019

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Soil cyanobacteria are crucial components of biological soil crusts and carry out many functions in dryland ecosystems. Despite this importance, their taxonomy and population genetics remain poorly known. We isolated 42 strains of simple filamentous cyanobacteria previously identified as Pseudophormidium hollerbachianum from 26 desert locations in the North and South America and characterized these strains using a total evidence approach, that is, using both morphological and molecular data to arrive at taxonomic decisions. Based on a phylogenetic analysis of 16S rRNA gene sequences, we propose and characterize Myxacorys gen. nov. with two new species Myxacorys chilensis, the generitype, and M. californica. We also found distinct 16S‐23S ITS sequence variability within species in our dataset. Especially interesting was the presence of two distinct lineages of M. californica obtained from locations in close spatial proximity (within a few meters to kilometers from each other) suggesting niche differentiation. The detection of such unrecognized lineage‐level variability in soil cyanobacteria has important implications for biocrust restoration practices and conservation efforts.

“…Molecular evaluation is required for most of the baeocyte producers within Pleurocapsales because of the cryptic features of some taxa. The presence of cryptic species and genera (Kom arek et al 2014, Kom arek 2018 has been identified in members of the Synechococcales (Osorio-Santos et al 2014, Mai et al 2018, Nostocales (Bohunick a et al 2015, Shalygin et al 2017, Gonz alez-Resendiz et al 2018, and Oscillatoriales (Boyer et al 2002, Caires et al 2018 and we suspect cryptic taxa may be more widespread in baeocyte producing forms from order Pleurocapsales than currently known. Herein we describe a new genus and species, Odorella benthonica, following the monophyletic species concept sensu Johansen and Casamatta (2005), with biochemical profiling as done previously (Zimba et al 2017).…”

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confidence: 67%

Odorella benthonica gen. & sp. nov. (Pleurocapsales, Cyanobacteria): an odor and prolific toxin producer isolated from a California aqueduct

Shalygin

Huang

Allen

et al. 2019

Pleurocapsales are one of the least understood groups of cyanobacteria in terms of molecular systematics and biochemistry. Considering the high number of cryptic taxa within the Synechococcales and Oscillatoriales, it is likely that such taxa also occur in the Pleurocapsales. The new genus described in our research is the first known pleurocapsalean cryptic taxon. It produces off‐flavor and a large number of bioactive metabolites (n = 38) some of which can be toxic including four known microcystins. Using a polyphasic approach, we propose the establishment of the genus Odorella with the new species O. benthonica from material originally isolated from the California Aqueduct near Los Angeles.