Two new brackish-water species of centrohelid heliozoans (Haptista: Centroplasthelida), Choanocystis mylnikovi sp. n. and C. punctata sp. n., from Russia

Герасимова, Е. А.

doi:10.21685/1680-0826-2022-16-1-2

Cited by 3 publications

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“…These authors emended the diagnosis of Penard (1904), making the genus a home for all the centrohelids with notched bases of spine scales. Since then, many species have been described as members of Choanocystis , making it one of the most species‐rich (23 species) centrohelid genera (Gerasimova, 2022; Tikhonenkov & Mylnikov, 2010; Zlatogursky, 2014). Nevertheless, there are still only two species with sequenced SSU rDNA: Choanocystis symna Zlatogursky, 2014 (KF990487), and C .…”

Section: Introductionmentioning

confidence: 99%

Unexpected ubiquity of heart‐shaped scale morphotype in Centroplasthelida (Haptista): Ancestral trait or multiple acquisitions?

Gerasimova,

Mindolina,

Tikhonenkov

et al. 2023

J Eukaryotic Microbiology

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Centrohelids (Haptista: Centroplasthelida) are axopodial protists with a remarkable diversity of external siliceous scale morphologies. It is believed that the last common ancestor of centrohelids had a double layer of siliceous scales composed of plate scales closer to a cell surface and spine scales radiating outwards. The characteristic morphotype of spine scales with a heart‐shaped base was once believed to be a unique feature of the genus Choanocystis, as it was defined by Siemensma and Roijackers (1988). Further research revealed that this morphology is present in different and sometimes distantly related lineages: Ozanamiidae, Meringosphaeridae, and Marophryidae. Here, we report the fourth clade, Pterocystidae, which is also revealed to contain representatives having this phenotype. Cernunnos gen. nov. is erected here to place Cernunnos uralica sp. nov., Cernunnos arctica sp. nov., Cernunnos america sp. nov., and Cernunnos antarctica Tikhonenkov et Mylnikov, 2010, Gerasimova comb. nov. C. uralica was studied with scanning electron microscopy and SSU rDNA sequencing. Molecular phylogenetic analysis placed it into marine environmental clade P within Pterocystida. The ubiquity of spine scales with heart‐shaped bases could be an example of parallel evolution, but taking into account the considerable similarity it is likely an ancestral trait, acquired from the last common ancestor of centrohelids.

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Section: Introductionmentioning

confidence: 99%

Unexpected ubiquity of heart‐shaped scale morphotype in Centroplasthelida (Haptista): Ancestral trait or multiple acquisitions?

Gerasimova,

Mindolina,

Tikhonenkov

et al. 2023

J Eukaryotic Microbiology

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Centrohelid heliozoans of Ukraine with a description of a new genus and species (Haptista: Centroplasthelida)

Zagumyonnyi

Radaykina²,

Keeling³

et al. 2022

European Journal of Protistology

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Taxonomic Structure of Planktonic Protist Communities in Saline and Hypersaline Continental Waters Revealed by Metabarcoding

Gerasimova,

Balkin,

Filonchikova

et al. 2023

Water

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Saline and hypersaline waters are one of the most peculiar ecosystems of our planet, characterized by extreme life conditions. Despite their worldwide distribution, the diversity and abundance of protist communities in these ecosystems remain poorly studied. Here, we analyze planktonic communities of protists sampled across 38 saline and hypersaline water environments (2–390‰) from arid climatic zones of the South Urals and Crimea in light of environmental data using high-throughput 18S rDNA amplicon sequencing. A total of 9 eukaryotic supergroups, 34 phyla, 104 classes, 184 orders, 315 families and 548 genera have been identified. We revealed significant differences in the taxonomic structure of protist communities depending on salinity, geographic location and pH. The protist communities demonstrated linear regression of richness and diversity and growth of the percentage of unclassified Eukaryota (up to 43%) with the increase in salinity. Centrohelids demonstrated the ability to inhabit a broad range of salinities, up to 320‰, which is four times higher than previously reported. Centrohelid species Pinjata ruminata and Yogsothoth sp. are assumed to be specifically adapted to salinity of 3–210‰. The obtained results provide insight into the taxonomy and diversity of protists in saline and hypersaline environments and highlight the great potential for the discovery of new taxa due to the large number of unclassified 18S rDNA sequences.

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Two new brackish-water species of centrohelid heliozoans (Haptista: Centroplasthelida), Choanocystis mylnikovi sp. n. and C. punctata sp. n., from Russia

Cited by 3 publications

References 0 publications

Unexpected ubiquity of heart‐shaped scale morphotype in Centroplasthelida (Haptista): Ancestral trait or multiple acquisitions?

Unexpected ubiquity of heart‐shaped scale morphotype in Centroplasthelida (Haptista): Ancestral trait or multiple acquisitions?

Centrohelid heliozoans of Ukraine with a description of a new genus and species (Haptista: Centroplasthelida)

Taxonomic Structure of Planktonic Protist Communities in Saline and Hypersaline Continental Waters Revealed by Metabarcoding

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