Taxonomic re-examination of "Chloromonas nivalis (Volvocales, Chlorophyceae) zygotes" from Japan and description of C. muramotoi sp. nov

Recent molecular data has strongly suggested that field-collected cysts of snow algae that are morphologically identifiable as the zygotes of Chloromonas nivalis are composed of multiple species. Motile vegetative cells, however, have not been directly obtained from these cysts because of the diffic...

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Veröffentlicht in:PloS one 2019-01, Vol.14 (1), p.e0210986-e0210986
Hauptverfasser: Matsuzaki, Ryo, Nozaki, Hisayoshi, Takeuchi, Nozomu, Hara, Yoshiaki, Kawachi, Masanobu
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Nozaki, Hisayoshi
Takeuchi, Nozomu
Hara, Yoshiaki
Kawachi, Masanobu
description Recent molecular data has strongly suggested that field-collected cysts of snow algae that are morphologically identifiable as the zygotes of Chloromonas nivalis are composed of multiple species. Motile vegetative cells, however, have not been directly obtained from these cysts because of the difficulties involved in inducing their germination. Recently, our comparative molecular analyses, using both field-collected and cultured materials, demonstrated that one Japanese lineage of "C. nivalis zygotes" belongs to C. miwae. Herein, we examined another Japanese lineage of field-collected "C. nivalis zygotes" and a new strain originating from Japan. Our molecular data demonstrated that these two different life cycle stages are conspecific, and that they represent a new species that we herein describe as C. muramotoi sp. nov., based on the vegetative and asexual morphological characteristics of the strain. Multigene phylogenetic analyses showed that this new species was sister to C. miwae. Scanning electron microscopy demonstrated that the cysts of C. muramotoi are different from those of C. miwae, based on the arrangement of the flanges developing on the cell wall.
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subjects Algae
Biology and Life Sciences
Cell walls
Chloromonas nivalis
Chlorophyceae - classification
Chlorophyceae - genetics
Chlorophyceae - ultrastructure
Cladistic analysis
Computer and Information Sciences
Cysts
Deoxyribonucleic acid
DNA
DNA, Algal - genetics
Ecosystem biology
Ecosystems
Electron microscopy
Environmental studies
Flanges
Germination
Green algae
Japan
Life cycle engineering
Life cycles
Microscopy, Electron, Transmission
Morphology
National parks
New species
Phylogeny
Physical characteristics
Research and Analysis Methods
Scanning electron microscopy
Scanning microscopy
Sequence Analysis, DNA
Snow
Species Specificity
Strain analysis
Taxonomy
Vegetative cells
Zygote - ultrastructure
Zygotes
title Taxonomic re-examination of "Chloromonas nivalis (Volvocales, Chlorophyceae) zygotes" from Japan and description of C. muramotoi sp. nov
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