Two new needle-shaped<i>Nitzschia</i>taxa from a deep East African crater lake

Cocquyt, Christine; Ryken, Els

doi:10.1080/0269249x.2017.1401009

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…present in N. obsoleta, though less strongly developed(Figs 40, 43), and perhaps also in the recently described N. fabiennejansseniana(Cocquyt & Ryken 2017; figs 32, 33). Furthermore, in terms of morphometrics (length, width, stria and fibula density: Table2,Fig.…”

supporting

confidence: 56%

“…There is no obvious difference between them in valve structure and, as Table 2 shows, these two species cannot be separated by length, width, and fibula and stria density. Comparisons between these two species were not included in Cocquyt & Ryken's (2017) paper describing N. fabiennejansseniana but it seems very likely to us that it is a later synonym of N. obsoleta. However, this issue was not the focus of our work and a final decision should await a more complete examination of both species.…”

Section: Morphology Of N Fenestralis and Similar Speciesmentioning

confidence: 99%

“…raphe structure, areolae, girdle bands). Thus, in the LMs of whole valves of N. fabiennejansseniana given by Cocquyt & Ryken (2017) the striae are mostly invisible and the poles of this species are shown for only one valve in SEM (ibid., figs 32, 33); this particular valve had radiate polar striae like N fenestralis but it is unclear whether this is characteristic of N. fabiennejansseniana or not and stria orientation is not mentioned in Cocquyt & Ryken's (2017) description of the species.…”

Section: Noteworthy Morphological Features Of N Fenestralismentioning

confidence: 99%

“…We give the formal description of N. fenestralis at the beginning multiple delicate morphological features not visible under LM that are useful in identifying and categorizing Nitzschia species. Thus, for example, use of SEM has facilitated the descriptions of several new Nitzschia species from lakes Victoria (Sitoki et al 2013) and Challa (Cocquyt & Ryken 2017).…”

Section: Introductionmentioning

confidence: 99%

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Nitzschia fenestralis: A new diatom species abundant in the Holocene sediments of an eastern African crater lake

Grady¹,

Mann²,

Trobajo³

2020

Fottea

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Nitzschia is common in the phytoplankton of several East African lakes. A new species, Nitzschia fenestralis, sp. nov. D. Grady, D.G. Mann et Trobajo was encountered at numerous depths in a 16 m sediment core from Lake Babogaya, Ethiopia and is described using light and scanning electron microscopy. It is compared with several other morphologically similar taxa described from East and Central Africa (especially N. aequalis, N. mediocris, N. obsoleta and N. fabiennejansseniana), and from Europe (N. fruticosa). An unusual feature of some of these species (N. fenestralis, N. obsoleta and N. fabiennejansseniana) is that in the raphe canal each stria is represented by two narrower areolae (alternatively interpreted as a single subdivided areola). It is this feature that suggested the name of the new species (through the resemblance to a series of sash windows). Another characteristic of N. fenestralis and N. obsoleta, apparently never reported previously in any diatom, is that the more advalvar bands end approximately halfway along the frustules, rather than at the poles. In most respects (shape and size, stria and fibula densities, valve and girdle structure), N. fenestralis and N. obsoleta are very similar, but confusion is unlikely because they differ in whether central raphe endings are present (N. fenestralis) or absent (N. obsoleta). In Nitzschia fenestralis, and perhaps to a lesser extent in N. obsoleta, the striae usually become strongly radiate towards the poles. A preliminary assessment, based on the literature, suggests that N. fabiennejansseniana may be synonymous with N. obsoleta, which was described earlier.

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supporting

confidence: 56%

Section: Morphology Of N Fenestralis and Similar Speciesmentioning

confidence: 99%

Section: Noteworthy Morphological Features Of N Fenestralismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitzschia fenestralis: A new diatom species abundant in the Holocene sediments of an eastern African crater lake

Grady¹,

Mann²,

Trobajo³

2020

Fottea

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“…In recent years, many new species were described from different parts of Africa. Various studies confirm the presence of a unique diatom diversity, composed of rare and endemic diatoms species (Cocquyt et al 2013(Cocquyt et al , 2014Cocquyt and Ryken 2017;Taylor et al 2014b).…”

Section: Introductionmentioning

confidence: 97%

Description of four new terrestrial diatom species from Luticola and Microcostatus genera from South Africa

Rybak

Kochman-Kędziora

Peszek

2021

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The knowledge about terrestrial diatom assemblages in southern Africa is rather limited, despite a long history of diatom research in this area. Terrestrial habitats are places of characteristic diatom floras, dominated by species resistant to desiccation which are able to thrive in conditions of limited water availability. The presented work expands the knowledge about these unique habitats. During the study on terrestrial moss-inhabiting diatoms from Western Cape Province (South Africa), four taxa with a unique set of valve features have been found and described herein as new species, based on light and scanning electron microscopy. These new species are: Luticola microcephala M. Rybak, Peszek & Kochman-Kędziora, sp. nov., Luticola asymmetrica M. Rybak, Kochman-Kędziora & Peszek, sp. nov., Luticola terrestris Kochman-Kędziora, M. Rybak & Peszek, sp. nov. and Microcostatus meridionalis Peszek, M. Rybak & Kochman-Kędziora, sp. nov. Algal community composition had low species richness (9–15 taxa per sample) and samples were dominated by: Humidophila contenta, Nitzschia brevissima and Eunotia aff. pseudominor. The three new Luticola species formed numerous populations, exceeding 10% of the share, whereas Microcostatus meridionalis reached 5.4%. Basic morphological data of associated diatom flora together with detailed micrographs are also provided.

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A bibliometric study on the use of diatoms in water quality monitoring and bioassessment in Africa across 10-year (2012–2022) period

Mbao

Odinga²,

Nyika³

et al. 2022

Aquat Sci

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Two new needle-shapedNitzschiataxa from a deep East African crater lake

Cited by 5 publications

References 13 publications

Nitzschia fenestralis: A new diatom species abundant in the Holocene sediments of an eastern African crater lake

Nitzschia fenestralis: A new diatom species abundant in the Holocene sediments of an eastern African crater lake

Description of four new terrestrial diatom species from Luticola and Microcostatus genera from South Africa

A bibliometric study on the use of diatoms in water quality monitoring and bioassessment in Africa across 10-year (2012–2022) period

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