Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica
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 Mt. Falla (uppermost Fremouw Formation) in the central Transantarctic Mountains ext...
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/10639 2023-05-15T13:32:09+02:00 Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica Bergene, Julie Anne Taylor, Edith L Taylor, Thomas N Crawford, Daniel J 2012 52 pages http://hdl.handle.net/1808/10639 http://dissertations.umi.com/ku:12113 en eng University of Kansas http://dissertations.umi.com/ku:12113 http://hdl.handle.net/1808/10639 This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess Plant biology Biology Paleontology Antarctica Compression Dordrechtites Permineralization Reproductive structure Triassic Thesis 2012 ftunivkansas 2022-08-26T13:12:22Z 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 Mt. 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 is described, D. arcanus, which includes internal anatomy of the two elongate arms and 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 µm 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 further the new species described herein is considered incertae sedis within the gymnosperms. Thesis Antarc* Antarctica The University of Kansas: KU ScholarWorks Falla ENVELOPE(164.917,164.917,-84.367,-84.367) Transantarctic Mountains |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
English |
topic |
Plant biology Biology Paleontology Antarctica Compression Dordrechtites Permineralization Reproductive structure Triassic |
spellingShingle |
Plant biology Biology Paleontology Antarctica Compression Dordrechtites Permineralization Reproductive structure Triassic Bergene, Julie Anne Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica |
topic_facet |
Plant biology Biology Paleontology Antarctica Compression Dordrechtites Permineralization Reproductive structure Triassic |
description |
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 Mt. 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 is described, D. arcanus, which includes internal anatomy of the two elongate arms and 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 µm 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 further the new species described herein is considered incertae sedis within the gymnosperms. |
author2 |
Taylor, Edith L Taylor, Thomas N Crawford, Daniel J |
format |
Thesis |
author |
Bergene, Julie Anne |
author_facet |
Bergene, Julie Anne |
author_sort |
Bergene, Julie Anne |
title |
Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica |
title_short |
Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica |
title_full |
Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica |
title_fullStr |
Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica |
title_full_unstemmed |
Dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the Middle Triassic of Antarctica |
title_sort |
dordrechtites arcanus , an anatomically preserved gymnospermous reproductive structure from the middle triassic of antarctica |
publisher |
University of Kansas |
publishDate |
2012 |
url |
http://hdl.handle.net/1808/10639 http://dissertations.umi.com/ku:12113 |
long_lat |
ENVELOPE(164.917,164.917,-84.367,-84.367) |
geographic |
Falla Transantarctic Mountains |
geographic_facet |
Falla Transantarctic Mountains |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
http://dissertations.umi.com/ku:12113 http://hdl.handle.net/1808/10639 |
op_rights |
This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess |
_version_ |
1766024527867805696 |