Quaternariella obscura Thomsen 1980
Quaternariella obscura Thomsen 1980d (Figs 21–33) This taxon was described based on material from West Greenland (Arctic Station). The main diagnostic feature is packages of rhombohedral crystallites (typically in groups of four) evenly distributed over the entire cell surface. The coccolith base pl...
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ftzenodo:oai:zenodo.org:12637798 2024-09-15T17:45:29+00:00 Quaternariella obscura Thomsen 1980 Thomsen, Helge A. Østergaard, Jette B. 2015-12-31 https://doi.org/10.5281/zenodo.12637798 http://treatment.plazi.org/id/2462E075FFAAA664666CFB65FA5914F6 unknown Zenodo https://doi.org/10.4467/16890027AP.15.013.3210 http://zenodo.org/record/12638210 http://publication.plazi.org/id/D85B980DFFACA66D655CFFA8FFE91774 https://sibils.text-analytics.ch/search/collections/plazi/2462E075FFAAA664666CFB65FA5914F6 https://doi.org/10.5281/zenodo.12638216 https://doi.org/10.5281/zenodo.12638218 https://zenodo.org/communities/biosyslit https://doi.org/10.5281/zenodo.12637797 https://doi.org/10.5281/zenodo.12637798 oai:zenodo.org:12637798 http://treatment.plazi.org/id/2462E075FFAAA664666CFB65FA5914F6 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Coccolithophorids in Polar Waters: Quaternariella and Porsildia gen. nov. Mercedesia gen. nov., Ericiolus,, pp. 155-169 in Acta Protozoologica, 54(3), 161-164, (2015-12-31) Biodiversity Taxonomy Chromista Haptophyta Coccolithophyceae Coccosphaerales Calyptrosphaeraceae Quaternariella Quaternariella obscura info:eu-repo/semantics/other 2015 ftzenodo https://doi.org/10.5281/zenodo.1263779810.4467/16890027AP.15.013.321010.5281/zenodo.1263821610.5281/zenodo.1263821810.5281/zenodo.12637797 2024-07-26T15:01:29Z Quaternariella obscura Thomsen 1980d (Figs 21–33) This taxon was described based on material from West Greenland (Arctic Station). The main diagnostic feature is packages of rhombohedral crystallites (typically in groups of four) evenly distributed over the entire cell surface. The coccolith base plate scale is circular and rimmed and has a diameter of approx. 0.6 µm (Thomsen 1980d). Evidence is also available documenting the presence of small non mineralized under layer scales (Thomsen 1980d; loc. cit. Fig. 6). Most probably there is a cluster of four crystallites in the centre of each scale. Here we illustrate additional material from the type locality (Figs 21–22) and also document the occurrence of this taxon in NE Greenland (NEW / Figs 23–27) as well as from Antarctica (EPOS / Figs 28–29). Irrespective of the origin of the material the general appearance is very similar. Numerical details have been accounted for in Table 3. We provide here for the first time evidence for the existence of different life cycle phases in Q. obscura (Figs 30–33). We found three combination cells in the Arctic that display typical Q. obscura holococcoliths in one half of the cell whereas the other half carries heterococcoliths that bear resemblance to e.g. Papposphaera spp. (Figs 30, 32). The contours of the individual heterococcolith can be traced and we can additionally account for at least some details of the rim calcification. In the combination cells (Figs 30, 32) the heterococcolith rims have fallen apart into the individual elements. This probably is due to the very delicate structure of the rim. The heterococcolith central area is oval and measures 0.47–0.61 × 0.82–0.96 µm which is within the size range typical for species of Papposphaera . Unfortunately we were not able to resolve the exact structure of the central area calcification, although Fig. 33 shows that it seems to consist of a heap of irregularly placed elements. The rim consists of a proximal/inner cycle of rod shaped elements aligned end-to-end (Figs 30, ... Other/Unknown Material Antarc* Antarctica Greenland Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Biodiversity Taxonomy Chromista Haptophyta Coccolithophyceae Coccosphaerales Calyptrosphaeraceae Quaternariella Quaternariella obscura |
spellingShingle |
Biodiversity Taxonomy Chromista Haptophyta Coccolithophyceae Coccosphaerales Calyptrosphaeraceae Quaternariella Quaternariella obscura Thomsen, Helge A. Østergaard, Jette B. Quaternariella obscura Thomsen 1980 |
topic_facet |
Biodiversity Taxonomy Chromista Haptophyta Coccolithophyceae Coccosphaerales Calyptrosphaeraceae Quaternariella Quaternariella obscura |
description |
Quaternariella obscura Thomsen 1980d (Figs 21–33) This taxon was described based on material from West Greenland (Arctic Station). The main diagnostic feature is packages of rhombohedral crystallites (typically in groups of four) evenly distributed over the entire cell surface. The coccolith base plate scale is circular and rimmed and has a diameter of approx. 0.6 µm (Thomsen 1980d). Evidence is also available documenting the presence of small non mineralized under layer scales (Thomsen 1980d; loc. cit. Fig. 6). Most probably there is a cluster of four crystallites in the centre of each scale. Here we illustrate additional material from the type locality (Figs 21–22) and also document the occurrence of this taxon in NE Greenland (NEW / Figs 23–27) as well as from Antarctica (EPOS / Figs 28–29). Irrespective of the origin of the material the general appearance is very similar. Numerical details have been accounted for in Table 3. We provide here for the first time evidence for the existence of different life cycle phases in Q. obscura (Figs 30–33). We found three combination cells in the Arctic that display typical Q. obscura holococcoliths in one half of the cell whereas the other half carries heterococcoliths that bear resemblance to e.g. Papposphaera spp. (Figs 30, 32). The contours of the individual heterococcolith can be traced and we can additionally account for at least some details of the rim calcification. In the combination cells (Figs 30, 32) the heterococcolith rims have fallen apart into the individual elements. This probably is due to the very delicate structure of the rim. The heterococcolith central area is oval and measures 0.47–0.61 × 0.82–0.96 µm which is within the size range typical for species of Papposphaera . Unfortunately we were not able to resolve the exact structure of the central area calcification, although Fig. 33 shows that it seems to consist of a heap of irregularly placed elements. The rim consists of a proximal/inner cycle of rod shaped elements aligned end-to-end (Figs 30, ... |
format |
Other/Unknown Material |
author |
Thomsen, Helge A. Østergaard, Jette B. |
author_facet |
Thomsen, Helge A. Østergaard, Jette B. |
author_sort |
Thomsen, Helge A. |
title |
Quaternariella obscura Thomsen 1980 |
title_short |
Quaternariella obscura Thomsen 1980 |
title_full |
Quaternariella obscura Thomsen 1980 |
title_fullStr |
Quaternariella obscura Thomsen 1980 |
title_full_unstemmed |
Quaternariella obscura Thomsen 1980 |
title_sort |
quaternariella obscura thomsen 1980 |
publisher |
Zenodo |
publishDate |
2015 |
url |
https://doi.org/10.5281/zenodo.12637798 http://treatment.plazi.org/id/2462E075FFAAA664666CFB65FA5914F6 |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_source |
Coccolithophorids in Polar Waters: Quaternariella and Porsildia gen. nov. Mercedesia gen. nov., Ericiolus,, pp. 155-169 in Acta Protozoologica, 54(3), 161-164, (2015-12-31) |
op_relation |
https://doi.org/10.4467/16890027AP.15.013.3210 http://zenodo.org/record/12638210 http://publication.plazi.org/id/D85B980DFFACA66D655CFFA8FFE91774 https://sibils.text-analytics.ch/search/collections/plazi/2462E075FFAAA664666CFB65FA5914F6 https://doi.org/10.5281/zenodo.12638216 https://doi.org/10.5281/zenodo.12638218 https://zenodo.org/communities/biosyslit https://doi.org/10.5281/zenodo.12637797 https://doi.org/10.5281/zenodo.12637798 oai:zenodo.org:12637798 http://treatment.plazi.org/id/2462E075FFAAA664666CFB65FA5914F6 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.1263779810.4467/16890027AP.15.013.321010.5281/zenodo.1263821610.5281/zenodo.1263821810.5281/zenodo.12637797 |
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1810493326672003072 |