Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules
Corystosperms, a key extinct group of Late Permian to Early Cretaceous plants, are important for understanding seed plant phylogeny, including the evolution of the angiosperm carpel and anatropous bitegmic ovule. Here, we describe a new species of corystosperm seed-bearing organ, Umkomasia mongolica...
Published in: | New Phytologist |
---|---|
Main Authors: | , , , , , , , |
Format: | Report |
Language: | English |
Published: |
WILEY-BLACKWELL
2016
|
Subjects: | |
Online Access: | http://ir.nigpas.ac.cn/handle/332004/21070 https://doi.org/10.1111/nph.13871 |
id |
ftchinacscnigpas:oai:ir.nigpas.ac.cn:332004/21070 |
---|---|
record_format |
openpolar |
spelling |
ftchinacscnigpas:oai:ir.nigpas.ac.cn:332004/21070 2023-05-15T13:41:28+02:00 Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules Shi, Gongle Leslie, Andrew B. Herendeen, Patrick S. Herrera, Fabiany Ichinnorov, Niiden Takahashi, Masamichi Knopf, Patrick Crane, Peter R. 2016-06-01 http://ir.nigpas.ac.cn/handle/332004/21070 https://doi.org/10.1111/nph.13871 英语 eng WILEY-BLACKWELL NEW PHYTOLOGIST http://ir.nigpas.ac.cn/handle/332004/21070 doi:10.1111/nph.13871 corystosperms Early Cretaceous homology Mongolia seed seed ferns ANCIENT CONIFERS SP-NOV PLANTS MORPHOLOGY ORIGIN ANGIOSPERMS ANTARCTICA DICROIDIUM PHYLOGENY Plant Sciences 期刊论文 2016 ftchinacscnigpas https://doi.org/10.1111/nph.13871 2019-08-14T12:44:50Z Corystosperms, a key extinct group of Late Permian to Early Cretaceous plants, are important for understanding seed plant phylogeny, including the evolution of the angiosperm carpel and anatropous bitegmic ovule. Here, we describe a new species of corystosperm seed-bearing organ, Umkomasia mongolica sp. nov., based on hundreds of three-dimensionally preserved mesofossils from the Early Cretaceous of Mongolia. Individual seed-bearing units of U. mongolica consist of a bract subtending an axis that bifurcates, with each fork (cupule stalk) bearing a cupule near the tip. Each cupule is formed by the strongly reflexed cupule stalk and two lateral flaps that partially enclose an erect seed. The seed is borne at, or close to, the tip of the reflexed cupule stalk, with the micropyle oriented towards the stalk base. The corystosperm cupule is generally interpreted as a modified leaf that bears a seed on its abaxial surface. However, U. mongolica suggests that an earlier interpretation, in which the seed is borne directly on an axis (shoot), is equally likely. The 'axial' interpretation suggests a possible relationship of corystosperms to Ginkgo. It also suggests that the cupules of corystosperms may be less distinct from those of Caytonia than has previously been supposed. Report Antarc* Antarctica Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) New Phytologist 210 4 1418 1429 |
institution |
Open Polar |
collection |
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacscnigpas |
language |
English |
topic |
corystosperms Early Cretaceous homology Mongolia seed seed ferns ANCIENT CONIFERS SP-NOV PLANTS MORPHOLOGY ORIGIN ANGIOSPERMS ANTARCTICA DICROIDIUM PHYLOGENY Plant Sciences |
spellingShingle |
corystosperms Early Cretaceous homology Mongolia seed seed ferns ANCIENT CONIFERS SP-NOV PLANTS MORPHOLOGY ORIGIN ANGIOSPERMS ANTARCTICA DICROIDIUM PHYLOGENY Plant Sciences Shi, Gongle Leslie, Andrew B. Herendeen, Patrick S. Herrera, Fabiany Ichinnorov, Niiden Takahashi, Masamichi Knopf, Patrick Crane, Peter R. Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules |
topic_facet |
corystosperms Early Cretaceous homology Mongolia seed seed ferns ANCIENT CONIFERS SP-NOV PLANTS MORPHOLOGY ORIGIN ANGIOSPERMS ANTARCTICA DICROIDIUM PHYLOGENY Plant Sciences |
description |
Corystosperms, a key extinct group of Late Permian to Early Cretaceous plants, are important for understanding seed plant phylogeny, including the evolution of the angiosperm carpel and anatropous bitegmic ovule. Here, we describe a new species of corystosperm seed-bearing organ, Umkomasia mongolica sp. nov., based on hundreds of three-dimensionally preserved mesofossils from the Early Cretaceous of Mongolia. Individual seed-bearing units of U. mongolica consist of a bract subtending an axis that bifurcates, with each fork (cupule stalk) bearing a cupule near the tip. Each cupule is formed by the strongly reflexed cupule stalk and two lateral flaps that partially enclose an erect seed. The seed is borne at, or close to, the tip of the reflexed cupule stalk, with the micropyle oriented towards the stalk base. The corystosperm cupule is generally interpreted as a modified leaf that bears a seed on its abaxial surface. However, U. mongolica suggests that an earlier interpretation, in which the seed is borne directly on an axis (shoot), is equally likely. The 'axial' interpretation suggests a possible relationship of corystosperms to Ginkgo. It also suggests that the cupules of corystosperms may be less distinct from those of Caytonia than has previously been supposed. |
format |
Report |
author |
Shi, Gongle Leslie, Andrew B. Herendeen, Patrick S. Herrera, Fabiany Ichinnorov, Niiden Takahashi, Masamichi Knopf, Patrick Crane, Peter R. |
author_facet |
Shi, Gongle Leslie, Andrew B. Herendeen, Patrick S. Herrera, Fabiany Ichinnorov, Niiden Takahashi, Masamichi Knopf, Patrick Crane, Peter R. |
author_sort |
Shi, Gongle |
title |
Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules |
title_short |
Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules |
title_full |
Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules |
title_fullStr |
Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules |
title_full_unstemmed |
Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules |
title_sort |
early cretaceous umkomasia from mongolia: implications for homology of corystosperm cupules |
publisher |
WILEY-BLACKWELL |
publishDate |
2016 |
url |
http://ir.nigpas.ac.cn/handle/332004/21070 https://doi.org/10.1111/nph.13871 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
NEW PHYTOLOGIST http://ir.nigpas.ac.cn/handle/332004/21070 doi:10.1111/nph.13871 |
op_doi |
https://doi.org/10.1111/nph.13871 |
container_title |
New Phytologist |
container_volume |
210 |
container_issue |
4 |
container_start_page |
1418 |
op_container_end_page |
1429 |
_version_ |
1766151148460310528 |