Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica
This is the publisher's version of an article which is being shared with permission. The original version may be accessed at: http://dx.doi.org/10.1086/668792 The genus Dordrechtites is an isolated ovulate structure previously described only from South Africa and Australia as impressions. The d...
Published in: | International Journal of Plant Sciences |
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Language: | English |
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2014
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Online Access: | http://hdl.handle.net/1808/13678 https://doi.org/10.1086/668792 |
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/13678 2023-05-15T13:32:09+02:00 Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica Bergene, Julie Anne Taylor, Edith L. Taylor, Thomas N. 2014-05-19T19:54:09Z http://hdl.handle.net/1808/13678 https://doi.org/10.1086/668792 en eng University of Chicago Press http://hdl.handle.net/1808/13678 doi:10.1086/668792 openAccess Triassic Gymnosperm Cupule Ovules Central transantarctic mountains Article 2014 ftunivkansas https://doi.org/10.1086/668792 2022-08-26T13:14:36Z This is the publisher's version of an article which is being shared with permission. The original version may be accessed at: http://dx.doi.org/10.1086/668792 The genus Dordrechtites is an isolated ovulate structure previously described only from South Africa and Australia as impressions. The discovery of compressed and permineralized specimens of this taxon at the base of Mount Falla (uppermost Fremouw Formation) in the central Transantarctic Mountains extends the geographical and geological distribution of the genus and increases the known floral diversity of the Triassic of Antarctica. The first permineralized species, Dordrechtites arcanus, is described using standard acetate peel techniques and includes internal anatomy of an elongate arm that extends over the top of a central cupule containing two elongate, bilaterally symmetrical, orthotropous ovules. An arc-shaped collateral vascular bundle extends from the arm into the top of the cupule, branches, and then extends around the ovule to about halfway down to the micropylar end. The cupule is parenchymatous and includes transfusion tissue with cells that have pitted walls. The sclerotesta of the ovule is up to 200 mm thick, consisting of an outer layer with longitudinally oriented, thick-walled cells and an inner layer one cell thick of rectangular, thick-walled cells. The micropyle is flared at the attenuated tip of the pyramidal cupule. The four previously described species of Dordrechtites have uncertain affinities, and although the morphology and anatomy of this taxon is now known, the affinities within the gymnosperms are still uncertain. Article in Journal/Newspaper Antarc* Antarctica The University of Kansas: KU ScholarWorks Falla ENVELOPE(164.917,164.917,-84.367,-84.367) Mount Falla ENVELOPE(164.917,164.917,-84.367,-84.367) Transantarctic Mountains International Journal of Plant Sciences 174 2 250 265 |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
English |
topic |
Triassic Gymnosperm Cupule Ovules Central transantarctic mountains |
spellingShingle |
Triassic Gymnosperm Cupule Ovules Central transantarctic mountains Bergene, Julie Anne Taylor, Edith L. Taylor, Thomas N. Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica |
topic_facet |
Triassic Gymnosperm Cupule Ovules Central transantarctic mountains |
description |
This is the publisher's version of an article which is being shared with permission. The original version may be accessed at: http://dx.doi.org/10.1086/668792 The genus Dordrechtites is an isolated ovulate structure previously described only from South Africa and Australia as impressions. The discovery of compressed and permineralized specimens of this taxon at the base of Mount Falla (uppermost Fremouw Formation) in the central Transantarctic Mountains extends the geographical and geological distribution of the genus and increases the known floral diversity of the Triassic of Antarctica. The first permineralized species, Dordrechtites arcanus, is described using standard acetate peel techniques and includes internal anatomy of an elongate arm that extends over the top of a central cupule containing two elongate, bilaterally symmetrical, orthotropous ovules. An arc-shaped collateral vascular bundle extends from the arm into the top of the cupule, branches, and then extends around the ovule to about halfway down to the micropylar end. The cupule is parenchymatous and includes transfusion tissue with cells that have pitted walls. The sclerotesta of the ovule is up to 200 mm thick, consisting of an outer layer with longitudinally oriented, thick-walled cells and an inner layer one cell thick of rectangular, thick-walled cells. The micropyle is flared at the attenuated tip of the pyramidal cupule. The four previously described species of Dordrechtites have uncertain affinities, and although the morphology and anatomy of this taxon is now known, the affinities within the gymnosperms are still uncertain. |
format |
Article in Journal/Newspaper |
author |
Bergene, Julie Anne Taylor, Edith L. Taylor, Thomas N. |
author_facet |
Bergene, Julie Anne Taylor, Edith L. Taylor, Thomas N. |
author_sort |
Bergene, Julie Anne |
title |
Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica |
title_short |
Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica |
title_full |
Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica |
title_fullStr |
Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica |
title_full_unstemmed |
Dordrechtites Arcanus Sp. Nov., An Anatomically Preserved Gymnospermous Reproductive Structure From the Middle Triassic of Antarctica |
title_sort |
dordrechtites arcanus sp. nov., an anatomically preserved gymnospermous reproductive structure from the middle triassic of antarctica |
publisher |
University of Chicago Press |
publishDate |
2014 |
url |
http://hdl.handle.net/1808/13678 https://doi.org/10.1086/668792 |
long_lat |
ENVELOPE(164.917,164.917,-84.367,-84.367) ENVELOPE(164.917,164.917,-84.367,-84.367) |
geographic |
Falla Mount Falla Transantarctic Mountains |
geographic_facet |
Falla Mount Falla Transantarctic Mountains |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
http://hdl.handle.net/1808/13678 doi:10.1086/668792 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1086/668792 |
container_title |
International Journal of Plant Sciences |
container_volume |
174 |
container_issue |
2 |
container_start_page |
250 |
op_container_end_page |
265 |
_version_ |
1766024542195548160 |