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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
Flatworm cocoons in the abyss: same plan under pressure
| Title: | Flatworm cocoons in the abyss: same plan under pressure |
| Authors: | Kakui, Keiichi Browse this author →KAKEN DB | | Tsuyuki, Aoi Browse this author →KAKEN DB |
| Keywords: | deep sea | | early development | | egg capsule | | Japan | | ontogeny | | Platyhelminthes |
| Issue Date: | Jan-2024 |
| Publisher: | Royal Society Publishing |
| Journal Title: | Biology Letters |
| Volume: | 20 |
| Issue: | 1 |
| Start Page: | 20230506 |
| Publisher DOI: | 10.1098/rsbl.2023.0506 |
| PMID: | 38263880 |
| Abstract: | 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. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/91101 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 角井 敬知
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