<i>Planothidium lanceolatum</i> and <i>Planothidium frequentissimum</i> reinvestigated with molecular methods and morphology: four new species and the taxonomic importance of the sinus and cavum

Jahn, Regine; Abarca, Nélida; Gemeinholzer, Birgit; Mora, Demetrio; Skibbe, Oliver; Kulikovskiy, Maxim; Gusev, Evgeniy; Kusber, Wolf‐Henning; Zimmermann, Jonas

doi:10.1080/0269249x.2017.1312548

Cited by 46 publications

(51 citation statements)

References 36 publications

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“…Only in Planothidium do we see a similar structure, where there are multiseriate striae that are the same in raphe and raphless valves, with no more than five rows of areolae. Presence of cavum and sinus in Planothidium (Jahn et al 2017) distinguishes this genus easily from Platebaikalia gen. nov.…”

Section: Methodsmentioning

confidence: 93%

“…Presence of cavum in this species, like the sinus in the previously-mentioned P. strelnikovae demonstrates that these morphological features arose many times in different lineage of monoraphid diatoms. Presence of sinus or cavum is important feature for delimitation of two independent groups in the genus Planothidium (Jahn et al 2017). In many cases a sinus or cavum is present in rapheless valves only, but in the genus Gliwiczia Kulikovskiy, Lange-Bertalot & Witkowski a cavum is present on both valves (Kulikovskiy et al 2013).…”

Section: Methodsmentioning

confidence: 99%

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Platebaikalia - a new monoraphid diatom genus from ancient Lake Baikal with comments on the genus Platessa

Kulikovskiy¹,

Glushchenko²,

Генкал³

et al. 2020

Fottea

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A new monoraphid diatom genus, Platebaikalia gen. nov., was described based on a detailed morphological investigation using light and scanning electron microscopy. Previously Platessa elegans Kulikovskiy et Lange-Bertalot was described from ancient Lake Baikal, and this species serves as the generitype for the newlydescribed genus. Platebaikalia elegans is a rare taxon found in the deeper parts of Lake Baikal. Platebaikalia elegans is characterized by having multiseriate striae on the raphe valves with biseriate striae on the rapheless valves, though in some specimens a short third row of areolae may be present in some striae. Morphology of striae is helpful to distinguish the genus Platebaikalia from Platessa and other monoraphid genera. Other morphological features that differentiate our new genus from other monoraphid taxa are discussed. We review the morphological data on Platessa species, and based on these data can recognize eight groups of taxa in the genus. Our analysis shows that Platessa as currently circumscribed may contain groups of species that are quite different from one another morphologically, and possibly includes taxa that could be recognized as different at the genus level. A few new combinations are suggested when taxa from the genus Platessa transferred to genera Psammothidium and Planothidium. Some problems of taxonomy of monoraphid taxa are discussed and we believe that taxonomy of this group of diatoms is in need of special attention in future.

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Section: Methodsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Platebaikalia - a new monoraphid diatom genus from ancient Lake Baikal with comments on the genus Platessa

Kulikovskiy¹,

Glushchenko²,

Генкал³

et al. 2020

Fottea

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“…Only a few studies (e.g. Rovira 2013;Trobajo et al 2013;Kelly et al 2015, for the Nitzschia inconspicua Grunow species complex , Jahn et al 2017 for the Planothidium lanceolatum group) follow the precepts of integrative taxonomy which aims to delimit species on sets of different criteria such as morphology, DNA, physiology, ecology and biogeography (Dayrat 2005). This should prompt reconsideration of the boundaries of many poorly delimited diatom species and, potentially, enhance their value for ecological assessment.…”

Section: Conclusion: Limits Of the Proposed Methodology And Perspectmentioning

confidence: 99%

The potential of High-Throughput Sequencing (HTS) of natural samples as a source of primary taxonomic information for reference libraries of diatom barcodes

Rimet¹,

Abarca²,

Bouchez³

et al. 2018

Fottea

Self Cite

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Diatoms are used routinely to assess pollution level in rivers and lakes. Current methods are based on identification by light microscopy, which is laborious. An alternative is to identify species based on short DNA fragments and High-Throughput Sequencing (HTS). However a potential limitation is the incomplete coverage of species in reference barcode libraries. Usually these libraries are compiled by isolating cells, before culturing and sequencing them, which is tedious and often unsuccessful. Here we propose the use of rbcL sequences from environmental samples analysed by HTS. We set several criteria to ensure good sequence quality and correspondence with the target species observed in microscopy: the sequence needed to be abundant in the sample, and with no insertions nor deletions or stop codon, phylogenetic neighbour taxa had to correspond to neighbour taxonomic taxa expected from morphological observations. Four species from tropical rivers are given as examples, including one that is new to science.

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“…The genus was separated from Achnanthes Bory (1822: 79) based on thick bito multiseriate striae interrupted unilaterally by a "horseshoe" depression on the SV (Round & Bukhtiyarova 1996). Recent molecular analysis of freshwater Planothidium species showed that the shape of the depression on the SV (i.e., a single sinus vs a double cavum with a hood) and the striae ultrastructure are important taxonomic features (Jahn et al 2017). Indeed, scanning electron microscope (SEM) is needed to observe these highly variable structures, particularly striae.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, there are 98 taxonomically accepted Planothidium species and infraspecific names (Guiry & Guiry 2019), 24 of which are listed and 11 pictured in The Diatoms of North America (Spaulding et al 2008). The challenging taxonomy of the genus has been significantly improved lately by reinvestigating type materials with SEM and a more precise defining of new species from freshwaters worldwide (i.e., Novis et al 2012, Potapova 2012, Alvarez-Blanco & Blanco 2013, Bąk & Lange-Bertalot 2014, Jahn et al 2017.…”

Section: Introductionmentioning

confidence: 99%

Planothidium sheathii, a new monoraphid diatom species from rivers in California, USA

Stancheva

2019

Phytotaxa

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Planothidium sheathii sp. nov., a new species from rivers in California, USA, is described based on light and scanning electron microscopy. P. sheathii has broadly lanceolate to elliptic valves with obtusely rounded apices and a unique combination of morphological features, as follows: 1) cavum with broad hood aperture that flares out at the valve margin with open borders fused with the neighboring virgae on SV, 2) multiseriate striae, composed of five to six rows of same sized areolae on both valves, interrupted at valve mantle junction, and 3) areolae groups on valve mantle, with rounded areolae on RV, and rounded and elongated areolae on SV. Valve morphology of P. sheathii is discussed in comparison with similar freshwater taxa, from which the new species is clearly distinct.

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Planothidium lanceolatum and Planothidium frequentissimum reinvestigated with molecular methods and morphology: four new species and the taxonomic importance of the sinus and cavum

Cited by 46 publications

References 36 publications

Platebaikalia - a new monoraphid diatom genus from ancient Lake Baikal with comments on the genus Platessa

Platebaikalia - a new monoraphid diatom genus from ancient Lake Baikal with comments on the genus Platessa

The potential of High-Throughput Sequencing (HTS) of natural samples as a source of primary taxonomic information for reference libraries of diatom barcodes

Planothidium sheathii, a new monoraphid diatom species from rivers in California, USA

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