Description of Flexiglena gen. nov. and new members of Discoplastis and Euglenaformis (Euglenida)

Łukomska‐Kowalczyk, Maja; Chaber, Katarzyna; Fells, Alicja; Milanowski, Rafał; Zakryś, Bożena

doi:10.1111/jpy.13107

Cited by 13 publications

(17 citation statements)

References 30 publications

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“… Genus Discoplastis Triemer, 2006. Cells capable of metaboly, with a sharp, colourless tail [ 393 , 394 ]; two ribosomal operon-containing inverted repeats present in the plastid genome [ 384 ]. Type species: Euglena spathirhyncha Skuja, 1948 (= Discoplastis spathirhyncha ) ( plate F , 83).…”

Section: Euglenida and Symbiontidamentioning

confidence: 99%

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Euglenozoa: taxonomy, diversity and ecology, symbioses and viruses

et al. 2021

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Euglenozoa is a species-rich group of protists, which have extremely diverse lifestyles and a range of features that distinguish them from other eukaryotes. They are composed of free-living and parasitic kinetoplastids, mostly free-living diplonemids, heterotrophic and photosynthetic euglenids, as well as deep-sea symbiontids. Although they form a well-supported monophyletic group, these morphologically rather distinct groups are almost never treated together in a comparative manner, as attempted here. We present an updated taxonomy, complemented by photos of representative species, with notes on diversity, distribution and biology of euglenozoans. For kinetoplastids, we propose a significantly modified taxonomy that reflects the latest findings. Finally, we summarize what is known about viruses infecting euglenozoans, as well as their relationships with ecto- and endosymbiotic bacteria.

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Section: Euglenida and Symbiontidamentioning

confidence: 99%

“… Genus Flexiglena Zakryś and Łukomska, 2020. Highly metabolic cells with numerous small paramylon grains and a distinct large, single grain located near the stigma [ 394 ]. Type species: Euglena variabilis Klebs, 1883 (= Flexiglena variabilis ).…”

Section: Euglenida and Symbiontidamentioning

confidence: 99%

Euglenozoa: taxonomy, diversity and ecology, symbioses and viruses

et al. 2021

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“…Last, but not least, we found Flexiglena variabilis— a representative of the newest described euglenophyte genus, Flexiglena ( Łukomska-Kowalczyk et al 2021 )—to possess a single rDNA copy, even though its phylogenetic position among predominantly IR-bearing taxa ( Lepocinclis and Discoplastis spp. ; see fig.…”

Section: Resultsmentioning

confidence: 85%

Challenging the Importance of Plastid Genome Structure Conservation: New Insights From Euglenophytes

Maciszewski

Fells

Karnkowska

2022

Molecular Biology and Evolution

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Plastids, similarly to mitochondria, are organelles of endosymbiotic origin, which retained their vestigial genomes (ptDNA). Their unique architecture, commonly referred to as the quadripartite (four-part) structure, is considered to be strictly conserved; however, the bulk of our knowledge on their variability and evolutionary transformations comes from studies of the primary plastids of green algae and land plants. To broaden our perspective, we obtained seven new ptDNA sequences from freshwater species of photosynthetic euglenids – a group which obtained secondary plastids, known to have dynamically evolving genome structure, via endosymbiosis with a green alga. Our analyses have demonstrated that the evolutionary history of euglenid plastid genome structure is exceptionally convoluted, with patchy distribution of inverted ribosomal operon (rDNA) repeats, as well as several independent acquisitions of tandemly repeated rDNA copies. Moreover, we have shown that inverted repeats in euglenid ptDNA do not share their genome stabilizing property documented in chlorophytes. We hypothesize that the degeneration of the quadripartite structure of euglenid plastid genomes is connected to the group II intron expansion. These findings challenge the current global paradigms of plastid genome architecture evolution, and underscore the often-underestimated divergence between the functionality of shared traits in primary and complex plastid organelles.

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“…2002, Łukomska‐Kowalczyk et al. 2021). An additional step of whole genome amplification was carried out in the case of environmental samples (Bennett and Triemer 2012).…”

Section: Methodsmentioning

confidence: 99%

“… 2010 ) and Flexiglena (Łukomska‐Kowalczyk et al. 2021 ). All family representatives possess numerous, discoidal, parietal chloroplasts without pyrenoids.…”

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confidence: 99%

Toward the robust resolution of taxonomic ambiguity within Lepocinclis (Euglenida) based on DNA sequencing and morphology

Chaber

Łukomska‐Kowalczyk

Fells

et al. 2021

Journal of Phycology

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DNA sequences were analyzed for three groups of species from the Lepocinclis genus (L. acus‐like, L. oxyuris‐like, and L. tripteris‐like) along with cellular morphology. Phylogenetic analyses were based on nuclear SSU rDNA, LSU rDNA, and plastid‐encoded LSU rDNA. DNA sequences were obtained from species available in culture collections (L. acus SAG 1224‐1a and UTEX 1316) and those isolated directly from the environment in Poland (48 isolates), resulting in 79 new sequences. The obtained phylogenetic tree of Lepocinclis included 27 taxa, five of which are presented for the first time (L. convoluta, L. gracillimoides, L. longissima, L. pseudospiroides, and L. torta) and nine taxonomically verified and described. Based on morphology, literature data, and phylogenetic analyses, the following species were distinguished: in the L. acus‐like group, L. longissima and L. acus; in the L. tripteris‐like group, L. pseudospiroides, L. torta, and L. tripteris; in the L. oxyuris‐like group, L. gracillimoides, L. oxyuris var. oxyuris, and L. oxyuris var. helicoidea. For all verified species, diagnostic descriptions were emended, nomenclatural adjustments were made, and epitypes were designated.

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Description of Flexiglena gen. nov. and new members of Discoplastis and Euglenaformis (Euglenida)

Cited by 13 publications

References 30 publications

Euglenozoa: taxonomy, diversity and ecology, symbioses and viruses

Euglenozoa: taxonomy, diversity and ecology, symbioses and viruses

Challenging the Importance of Plastid Genome Structure Conservation: New Insights From Euglenophytes

Toward the robust resolution of taxonomic ambiguity within Lepocinclis (Euglenida) based on DNA sequencing and morphology

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