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

被引：1

作者：

Gerasimova, Elena A. A. ^{[1
]}

Mindolina, Yulia V. V. ^{[2
]}

Tikhonenkov, Denis V. V. ^{[1
,3
]}

Kataev, Vladimir Y. Y. ^{[2
]}

Balkin, Alexander S. S. ^{[2
]}

Mikhailov, Kirill V. V. ^{[4
,5
]}

Zagumyonnyi, Dmitry G. G. ^{[1
,3
]}

Plotnikov, Andrey O. O. ^{[2
]}

Zlatogursky, Vasily V. V. ^{[6
]}

机构：

[1] Univ Tyumen, AquaBioSafe Lab, Tyumen 625003, Russia

[2] Russian Acad Sci, Inst Cellular & Intracellular Symbiosis, Ural Branch, Orenburg, Russia

[3] Russian Acad Sci, Papanin Inst Biol Inland Waters, Borok, Russia

[4] Lomonosov Moscow State Univ, Belozersky Inst Physicochem Biol, Moscow, Russia

[5] Russian Acad Sci, Kharkevich Inst Informat Transmiss Problems, Moscow, Russia

[6] Univ British Columbia, Fac Sci, Dept Bot, Vancouver, BC, Canada

来源：

JOURNAL OF EUKARYOTIC MICROBIOLOGY | 2023年 / 70卷 / 06期

基金：

俄罗斯科学基金会;

关键词：

centrohelids; Cernunnos; electron microscopy; external skeleton; NGS; protists; SSU rDNA; CENTROHELID HELIOZOANS; SP N; PHYLOGENY; EVOLUTION; TAXONOMY; MARINE; MODEL; DIVERSITY; DIVISION; HACROBIA;

D O I：

10.1111/jeu.12992

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

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.

引用

页数：18