Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification
The morphology, the infraciliature, some stages of cell division and physiological reorganization, and the SSU rRNA gene sequence of the little-known marine 18-cirri hypotrich Tachysoma rigescens (Kahl, 1932) Borror, 1972 [basionym Oxytricha (Tachysoma) rigescens], isolated from mariculture waters n...
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ftejournalsojs:oai:ojs.www.ejournals.eu:article/3854 2023-05-15T13:36:13+02:00 Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification LI, Liqiong HUANG, Jie SONG, Weibo SHIN, Mann Kyoon AL-RASHEID, Khaled A. S. BERGER, Helmut 2015-07-30 application/pdf http://www.ejournals.eu/sj/index.php/AProto/article/view/3854 pol pol Acta Protozoologica http://www.ejournals.eu/sj/index.php/AProto/article/view/3854/3778 http://www.ejournals.eu/sj/index.php/AProto/article/view/3854 ##submission.copyrightStatement## Acta Protozoologica; Vol 49, No 3 (2010); 195–212 1689-0027 0065-1583 China ecology Hemigastrostyla infraciliature ontogenesis Spirotricha Stichotrichia Yellow Sea info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Recenzowany artykuł 2015 ftejournalsojs 2020-03-01T09:10:56Z The morphology, the infraciliature, some stages of cell division and physiological reorganization, and the SSU rRNA gene sequence of the little-known marine 18-cirri hypotrich Tachysoma rigescens (Kahl, 1932) Borror, 1972 [basionym Oxytricha (Tachysoma) rigescens], isolated from mariculture waters near Qingdao, China, were investigated. This rare species is characterized, inter alia, by narrowly spaced, small, colourless cortical granules and several conspicuous ring-shaped structures in the cytoplasm. The caudal cirri and the simple dorsal kinety pattern (three bipolar kineties) are probably plesiomorphic traits within the Hypotricha, the composition of the adoral zone of the proter from new and parental membranelles, as well as the presence of two ‘extra’ cirri behind the right marginal row strongly suggest a misclassification in Tachysoma. The SSU rRNA gene sequence data indicate that T. rigescens branches off rather basally in the Hypotricha tree, which supports the hypothesis that the 18-cirri pattern occurred very early, probably already in the last common ancestor of the Hypotricha. A detailed survey of the early branching 18-cirri hypotrichs and similar taxa (e.g. Trachelostyla pediculiformis, Hemigastrostyla enigmatica, Protogastrostyla pulchra) reveals that for T. rigescens a new genus (Apogastrostyla gen. nov.) has to be established, because there are important differences, inter alia, in the dorsal infraciliature. Besides the type species, A. rigescens comb. nov., which seems to be confined to the northern hemisphere according to the sparse faunistic data, a second marine species, A. szaboi comb. nov. (basionym Hemigastrostyla szaboi), so far only twice recorded from the Antarctic region, can be included. The Chinese population is fixed as neotype to define the species objectively, because no type material of A. rigescens is present and the original type locality is not known. The species name Tachysoma multinucleate is emended: Tachysoma multinucleatum nom. corr. Article in Journal/Newspaper Antarc* Antarctic Portal Czasopism Naukowych (E-Journals) Antarctic The Antarctic |
institution |
Open Polar |
collection |
Portal Czasopism Naukowych (E-Journals) |
op_collection_id |
ftejournalsojs |
language |
Polish |
topic |
China ecology Hemigastrostyla infraciliature ontogenesis Spirotricha Stichotrichia Yellow Sea |
spellingShingle |
China ecology Hemigastrostyla infraciliature ontogenesis Spirotricha Stichotrichia Yellow Sea LI, Liqiong HUANG, Jie SONG, Weibo SHIN, Mann Kyoon AL-RASHEID, Khaled A. S. BERGER, Helmut Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification |
topic_facet |
China ecology Hemigastrostyla infraciliature ontogenesis Spirotricha Stichotrichia Yellow Sea |
description |
The morphology, the infraciliature, some stages of cell division and physiological reorganization, and the SSU rRNA gene sequence of the little-known marine 18-cirri hypotrich Tachysoma rigescens (Kahl, 1932) Borror, 1972 [basionym Oxytricha (Tachysoma) rigescens], isolated from mariculture waters near Qingdao, China, were investigated. This rare species is characterized, inter alia, by narrowly spaced, small, colourless cortical granules and several conspicuous ring-shaped structures in the cytoplasm. The caudal cirri and the simple dorsal kinety pattern (three bipolar kineties) are probably plesiomorphic traits within the Hypotricha, the composition of the adoral zone of the proter from new and parental membranelles, as well as the presence of two ‘extra’ cirri behind the right marginal row strongly suggest a misclassification in Tachysoma. The SSU rRNA gene sequence data indicate that T. rigescens branches off rather basally in the Hypotricha tree, which supports the hypothesis that the 18-cirri pattern occurred very early, probably already in the last common ancestor of the Hypotricha. A detailed survey of the early branching 18-cirri hypotrichs and similar taxa (e.g. Trachelostyla pediculiformis, Hemigastrostyla enigmatica, Protogastrostyla pulchra) reveals that for T. rigescens a new genus (Apogastrostyla gen. nov.) has to be established, because there are important differences, inter alia, in the dorsal infraciliature. Besides the type species, A. rigescens comb. nov., which seems to be confined to the northern hemisphere according to the sparse faunistic data, a second marine species, A. szaboi comb. nov. (basionym Hemigastrostyla szaboi), so far only twice recorded from the Antarctic region, can be included. The Chinese population is fixed as neotype to define the species objectively, because no type material of A. rigescens is present and the original type locality is not known. The species name Tachysoma multinucleate is emended: Tachysoma multinucleatum nom. corr. |
format |
Article in Journal/Newspaper |
author |
LI, Liqiong HUANG, Jie SONG, Weibo SHIN, Mann Kyoon AL-RASHEID, Khaled A. S. BERGER, Helmut |
author_facet |
LI, Liqiong HUANG, Jie SONG, Weibo SHIN, Mann Kyoon AL-RASHEID, Khaled A. S. BERGER, Helmut |
author_sort |
LI, Liqiong |
title |
Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification |
title_short |
Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification |
title_full |
Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification |
title_fullStr |
Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification |
title_full_unstemmed |
Apogastrostyla rigescens (Kahl, 1932) gen. nov., comb. nov. (Ciliophora, Hypotricha): Morphology, Notes on Cell Division, SSU rRNA Gene Sequence Data, and Neotypification |
title_sort |
apogastrostyla rigescens (kahl, 1932) gen. nov., comb. nov. (ciliophora, hypotricha): morphology, notes on cell division, ssu rrna gene sequence data, and neotypification |
publisher |
Acta Protozoologica |
publishDate |
2015 |
url |
http://www.ejournals.eu/sj/index.php/AProto/article/view/3854 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Acta Protozoologica; Vol 49, No 3 (2010); 195–212 1689-0027 0065-1583 |
op_relation |
http://www.ejournals.eu/sj/index.php/AProto/article/view/3854/3778 http://www.ejournals.eu/sj/index.php/AProto/article/view/3854 |
op_rights |
##submission.copyrightStatement## |
_version_ |
1766075476573421568 |