Flatworm cocoons in the abyss: same plan under pressure
While knowledge of early ontogeny in abyssal animals is highly limited in general, it was completely lacking for abyssal, free-living platyhelminths. We discovered flatworm egg capsules (or ‘cocoons') on rocks collected at depths of 6176–6200 m on the abyssal slope of the Kuril–Kamchatka Trench...
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crroyalsociety:10.1098/rsbl.2023.0506 2024-06-02T08:09:43+00:00 Flatworm cocoons in the abyss: same plan under pressure Kakui, Keiichi Tsuyuki, Aoi Atmosphere and Ocean Research Institute, The University of Tokyo Japan Society for the Promotion of Science 2024 http://dx.doi.org/10.1098/rsbl.2023.0506 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2023.0506 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2023.0506 en eng The Royal Society https://royalsociety.org/-/media/journals/author/Licence-to-Publish-20062019-final.pdf https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Biology Letters volume 20, issue 1 ISSN 1744-957X journal-article 2024 crroyalsociety https://doi.org/10.1098/rsbl.2023.0506 2024-05-07T14:16:54Z While knowledge of early ontogeny in abyssal animals is highly limited in general, it was completely lacking for abyssal, free-living platyhelminths. We discovered flatworm egg capsules (or ‘cocoons') on rocks collected at depths of 6176–6200 m on the abyssal slope of the Kuril–Kamchatka Trench, northwestern Pacific. The egg capsules were black and spherical, around 3 mm in diameter, and contained three to seven individuals ( n = 4) at the same developmental stage, either the spherical (putative early embryo) or vermiform (putative late embryo) stages. A molecular phylogenetic analysis based on 18S and 28S rRNA sequences revealed that the flatworms belong in suborder Maricola in Tricladida and suggested that they may have colonized from shallow to deep waters. This study provides the deepest record for free-living flatworms and the first information on their early life stages in the abyssal zone, which were very similar to those in shallow-water forms. This similarity in development between the relatively benign shallow-water and the extreme abyssal environments suggests that triclads adapting to the latter faced primarily physiological and/or ecological adaptive challenges rather than developmental ones. Article in Journal/Newspaper Kamchatka The Royal Society Pacific Biology Letters 20 1 |
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Open Polar |
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The Royal Society |
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crroyalsociety |
language |
English |
description |
While knowledge of early ontogeny in abyssal animals is highly limited in general, it was completely lacking for abyssal, free-living platyhelminths. We discovered flatworm egg capsules (or ‘cocoons') on rocks collected at depths of 6176–6200 m on the abyssal slope of the Kuril–Kamchatka Trench, northwestern Pacific. The egg capsules were black and spherical, around 3 mm in diameter, and contained three to seven individuals ( n = 4) at the same developmental stage, either the spherical (putative early embryo) or vermiform (putative late embryo) stages. A molecular phylogenetic analysis based on 18S and 28S rRNA sequences revealed that the flatworms belong in suborder Maricola in Tricladida and suggested that they may have colonized from shallow to deep waters. This study provides the deepest record for free-living flatworms and the first information on their early life stages in the abyssal zone, which were very similar to those in shallow-water forms. This similarity in development between the relatively benign shallow-water and the extreme abyssal environments suggests that triclads adapting to the latter faced primarily physiological and/or ecological adaptive challenges rather than developmental ones. |
author2 |
Atmosphere and Ocean Research Institute, The University of Tokyo Japan Society for the Promotion of Science |
format |
Article in Journal/Newspaper |
author |
Kakui, Keiichi Tsuyuki, Aoi |
spellingShingle |
Kakui, Keiichi Tsuyuki, Aoi Flatworm cocoons in the abyss: same plan under pressure |
author_facet |
Kakui, Keiichi Tsuyuki, Aoi |
author_sort |
Kakui, Keiichi |
title |
Flatworm cocoons in the abyss: same plan under pressure |
title_short |
Flatworm cocoons in the abyss: same plan under pressure |
title_full |
Flatworm cocoons in the abyss: same plan under pressure |
title_fullStr |
Flatworm cocoons in the abyss: same plan under pressure |
title_full_unstemmed |
Flatworm cocoons in the abyss: same plan under pressure |
title_sort |
flatworm cocoons in the abyss: same plan under pressure |
publisher |
The Royal Society |
publishDate |
2024 |
url |
http://dx.doi.org/10.1098/rsbl.2023.0506 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2023.0506 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2023.0506 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Biology Letters volume 20, issue 1 ISSN 1744-957X |
op_rights |
https://royalsociety.org/-/media/journals/author/Licence-to-Publish-20062019-final.pdf https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsbl.2023.0506 |
container_title |
Biology Letters |
container_volume |
20 |
container_issue |
1 |
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1800755492185702400 |