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

Autor: Gerasimova EA; AquaBioSafe Laboratory, University of Tyumen, Tyumen, Russia., Mindolina YV; Institute for Cellular and Intracellular Symbiosis of the Ural Branch, Russian Academy of Sciences, Orenburg, Russia., Tikhonenkov DV; AquaBioSafe Laboratory, University of Tyumen, Tyumen, Russia.; Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Russia., Kataev VY; Institute for Cellular and Intracellular Symbiosis of the Ural Branch, Russian Academy of Sciences, Orenburg, Russia., Balkin AS; Institute for Cellular and Intracellular Symbiosis of the Ural Branch, Russian Academy of Sciences, Orenburg, Russia., Mikhailov KV; Belozersky Institute for Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia.; Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia., Zagumyonnyi DG; AquaBioSafe Laboratory, University of Tyumen, Tyumen, Russia.; Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Russia., Plotnikov AO; Institute for Cellular and Intracellular Symbiosis of the Ural Branch, Russian Academy of Sciences, Orenburg, Russia., Zlatogursky VV; Department of Botany, Faculty of Science, University of British Columbia, Vancouver, British Columbia, Canada.
Jazyk: angličtina
Zdroj: The Journal of eukaryotic microbiology [J Eukaryot Microbiol] 2023 Nov-Dec; Vol. 70 (6), pp. e12992. Date of Electronic Publication: 2023 Jul 14.
DOI: 10.1111/jeu.12992
Abstrakt: 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.
(© 2023 International Society of Protistologists.)
Databáze: MEDLINE
Externí odkaz: