Defining the core group of the genus <i>Gomphonema</i> Ehrenberg with molecular and morphological methods

Abarca, Nélida; Zimmermann, Jonas; Kusber, Wolf‐Henning; Mora, Demetrio; Van, Anh Tu; Skibbe, Oliver; Jahn, Regine

doi:10.1080/23818107.2019.1694980

Cited by 17 publications

(7 citation statements)

References 57 publications

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“…As we have demonstrated in previous papers on taxa in the genera Planothidium, where we described four new species for Korea (Jahn et al 2017), Gomphonema, where we described one new species for Korea (Abarca et al 2014(Abarca et al , 2020, Gomphonella (Jahn et al 2019), and in this paper, many more micromorphological differentiating features can be established, which are supported by molecular data, when strains of target species are cultivated. With more Cocconeis placentula s.l.…”

Section: A C Bsupporting

confidence: 84%

Integrative taxonomic description of two new species of the Cocconeis placentula group (Bacillariophyceae) from Korea based on unialgal strains

Jahn¹,

Abarca²,

Kusber³

et al. 2020

ALGAE

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Section: A C Bsupporting

confidence: 84%

Integrative taxonomic description of two new species of the Cocconeis placentula group (Bacillariophyceae) from Korea based on unialgal strains

Jahn¹,

Abarca²,

Kusber³

et al. 2020

ALGAE

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“…1780) stored in the Ehrenberg collection, Museum für Naturkunde, Leibniz-Institut für Biodiversitäts- und Evolutionsforschung an der Humboldt Universität zu Berlin (BHUPM) with the mica-reference number 250502b blue. Additionally, in the Algae Collection, Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin (B) an isolectotype (B 40 0040891) was selected, and the strain D27_008 was designated as epitype with its V4 domain of 18S rDNA already published 20 ; rbc L and 28S rDNA sequences of Hantzschia amphioxys strain D27_008 have been submitted to NCBI in this study (for methods of extraction see Abarca et al 50 ).…”

Section: Methodsmentioning

confidence: 99%

Biogeography of the cosmopolitan terrestrial diatom Hantzschia amphioxys sensu lato based on molecular and morphological data

Maltsev

Maltseva

Kociolek

et al. 2021

Sci Rep

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Until now, the reported diversity of representatives from the genus Hantzschia inhabiting soils from different parts of Eurasia was limited to the few species H. amphioxys, H. elongata and H. vivax and some of their infraspecific taxa. We have studied the morphology, ultrastructure and phylogeny of 25 soil diatom strains, which according to published description would be assigned to “H. amphioxys sensu lato” using 18S rDNA, 28S rDNA and rbcL. We show that strains are made up of seven different species of Hantzschia, including five new for science. Five strains were identified as H. abundans. This species has a slight curvature of the raphe near its external proximal ends. Four of the examined strains were represented by different populations of H. amphioxys and their morphological characteristics fully correspond with its isolectotype and epitype. The main specific features of this species include 21–25 striae in 10 μm, 6–11 fibulae in 10 μm, 40–50 areolae in 10 μm and internal proximal raphe endings bent in opposite directions. H. attractiva sp. nov., H. belgica sp. nov., H. parva sp. nov., H. pseudomongolica sp. nov. and H. stepposa sp. nov. were described based on differences in the shape of the valves, significant differences in dimensions, a lower number of striae and areolae in 10 μm and the degree and direction of deflection of the internal central raphe endings. Based on the study of the morphological variability and phylogeny of soil Hantzschia-species from different geographical locations we conclude that while some species such as H. amphioxys are truly cosmopolitan in their distributions, some sympatric populations of pseudocryptic taxa exist in the Holarctic.

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“…can be seen in our data. Maximum likelihood analyses with rbcL grouped the isolates with other G. parvulum (Figure 1o); rbcL provides the best species resolution within the genus Gomphonema (Abarca et al, 2020) as well as within diatoms in general (Rimet et al, 2019;Vasselon et al, 2017;Zimmerman et al, 2014). All of the G. parvulum sequences grouped into a clade supported by SH-aLRT % and bootstrap values of 92.1 and 97, respectively.…”

Section: Identification Of the Isolatesmentioning

confidence: 94%

The chloroplast and mitochondrial genomes of two Gomphonema parvulum (Bacillariophyta) environmental isolates from South Carolina (United States) and Virginia (United States)

Cahoon,

Johnson,

Brown

et al. 2024

Journal of Phycology

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Gomphonema parvulum is a cosmopolitan freshwater diatom that is used as an indicator in water quality biomonitoring. In this study, we report the culturing of two geographically separated isolates from southeastern North America, their morphology, and the sequencing and assembly of their mitochondrial and chloroplast genomes. Morphologically, both strains fit G. parvulum sensu lato, but the frustules from a protected habitat in South Carolina were smaller than those cited in the historic data of this species from the same location as well as a second culture from Virginia. Phylogenetic analyses using the rbcL gene placed both within a clade with G. parvulum. Genetic markers, including full chloroplast and mitochondrial genomes and the nuclear small subunit rRNA gene region were assembled from each isolate. The organellar genomes of the two strains varied slightly in size due to small differences in intergenic regions with chloroplast genomes of 121,035 bp and 121,482 bp and mitochondrial genomes of 34,639 bp and 34,654 bp. The intraspecific pairwise identities of the chloroplast and mitochondrial genomes of these two isolates were 97.9% and 95.4%, respectively. Multigene phylogenetic analysis demonstrated a close relationship between G. parvulum, Gomphoneis minuta, and Didymosphenia geminata.

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Defining the core group of the genus Gomphonema Ehrenberg with molecular and morphological methods

Cited by 17 publications

References 57 publications

Integrative taxonomic description of two new species of the Cocconeis placentula group (Bacillariophyceae) from Korea based on unialgal strains

Integrative taxonomic description of two new species of the Cocconeis placentula group (Bacillariophyceae) from Korea based on unialgal strains

Biogeography of the cosmopolitan terrestrial diatom Hantzschia amphioxys sensu lato based on molecular and morphological data

The chloroplast and mitochondrial genomes of two Gomphonema parvulum (Bacillariophyta) environmental isolates from South Carolina (United States) and Virginia (United States)

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