Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic position
Fimbrora Monniot & Monniot, 1991, a macrophagous ascidian genus within the family Ascidiidae Adams & Adams, 1858, is currently monotypic, represented by F. calsubia Monniot & Monniot, 1991, a species previously recorded from the bottom of the South Pacific at dept...
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| Format: | Article |
| Language: | English |
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Pensoft Publishers
2024-01-01
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| Series: | Zoosystematics and Evolution |
| Online Access: | https://zse.pensoft.net/article/113132/download/pdf/ |
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| author | Naohiro Hasegawa Natsumi Hookabe Yoshihiro Fujiwara Naoto Jimi Hiroshi Kajihara |
| author_facet | Naohiro Hasegawa Natsumi Hookabe Yoshihiro Fujiwara Naoto Jimi Hiroshi Kajihara |
| author_sort | Naohiro Hasegawa |
| collection | DOAJ |
| description | Fimbrora Monniot & Monniot, 1991, a macrophagous ascidian genus within the family Ascidiidae Adams & Adams, 1858, is currently monotypic, represented by F. calsubia Monniot & Monniot, 1991, a species previously recorded from the bottom of the South Pacific at depths of 1000–1860 m. The taxonomic status of Fimbrora has remained ambiguous because characteristics in its branchial papillae and neural-gland opening are incompletely known in previous studies, while these traits are essential for distinguishing other ascidiid genera. So far, no nucleotide sequence representing F. calsubia is available. In this study, we collected a single specimen of F. calsubia at a depth of 2027 m, about 400 km off the Pacific coast of Honshu, Japan. This is the deepest record, as well as the first report from the North Pacific, for the species. Our examination indicates that Fimbrora is morphologically similar to another ascidiid genus, Psammascidia Monniot, 1962, by having only secondary branchial papillae in the pharynx. Our phylogenetic analysis, based on the 18S ribosomal RNA and cytochrome c oxidase subunit I genes, along with those of 27 ascidian species available in public databases, showed that F. calsubia was more closely related to Ascidia zara Oka, 1935, Phallusia fumigata (Grube, 1864) and Phallusia mammilata (Cuvier, 1815) than to Ascidia ceratodes (Huntsman, 1912), Ascidiella aspersa (Müller, 1776) and Ascidiella scabra (Müller, 1776). Our results also indicated that acquisitions of macrophagous feeding by deep-sea members happened independently at least three times in the evolutionary history of the entire Ascidiacea. |
| first_indexed | 2024-03-08T10:18:43Z |
| format | Article |
| id | doaj.art-6258b5dad3b44e8084e3a3128ba7826a |
| institution | Directory Open Access Journal |
| issn | 1860-0743 |
| language | English |
| last_indexed | 2024-03-08T10:18:43Z |
| publishDate | 2024-01-01 |
| publisher | Pensoft Publishers |
| record_format | Article |
| series | Zoosystematics and Evolution |
| spelling | doaj.art-6258b5dad3b44e8084e3a3128ba7826a2024-01-28T10:46:20ZengPensoft PublishersZoosystematics and Evolution1860-07432024-01-01100112914010.3897/zse.100.113132113132Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic positionNaohiro Hasegawa0Natsumi Hookabe1Yoshihiro Fujiwara2Naoto Jimi3Hiroshi Kajihara4Hokkaido UniversityResearch Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)Universiti Sains MalaysiaHokkaido UniversityFimbrora Monniot & Monniot, 1991, a macrophagous ascidian genus within the family Ascidiidae Adams & Adams, 1858, is currently monotypic, represented by F. calsubia Monniot & Monniot, 1991, a species previously recorded from the bottom of the South Pacific at depths of 1000–1860 m. The taxonomic status of Fimbrora has remained ambiguous because characteristics in its branchial papillae and neural-gland opening are incompletely known in previous studies, while these traits are essential for distinguishing other ascidiid genera. So far, no nucleotide sequence representing F. calsubia is available. In this study, we collected a single specimen of F. calsubia at a depth of 2027 m, about 400 km off the Pacific coast of Honshu, Japan. This is the deepest record, as well as the first report from the North Pacific, for the species. Our examination indicates that Fimbrora is morphologically similar to another ascidiid genus, Psammascidia Monniot, 1962, by having only secondary branchial papillae in the pharynx. Our phylogenetic analysis, based on the 18S ribosomal RNA and cytochrome c oxidase subunit I genes, along with those of 27 ascidian species available in public databases, showed that F. calsubia was more closely related to Ascidia zara Oka, 1935, Phallusia fumigata (Grube, 1864) and Phallusia mammilata (Cuvier, 1815) than to Ascidia ceratodes (Huntsman, 1912), Ascidiella aspersa (Müller, 1776) and Ascidiella scabra (Müller, 1776). Our results also indicated that acquisitions of macrophagous feeding by deep-sea members happened independently at least three times in the evolutionary history of the entire Ascidiacea.https://zse.pensoft.net/article/113132/download/pdf/ |
| spellingShingle | Naohiro Hasegawa Natsumi Hookabe Yoshihiro Fujiwara Naoto Jimi Hiroshi Kajihara Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic position Zoosystematics and Evolution |
| title | Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic position |
| title_full | Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic position |
| title_fullStr | Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic position |
| title_full_unstemmed | Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic position |
| title_short | Supplemental re-description of a deep-sea ascidian, Fimbrora calsubia (Ascidiacea, Enterogona), with an inference of its phylogenetic position |
| title_sort | supplemental re description of a deep sea ascidian fimbrora calsubia ascidiacea enterogona with an inference of its phylogenetic position |
| url | https://zse.pensoft.net/article/113132/download/pdf/ |
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