Umkomasia
Appearance
Umkomasia Temporal range:
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Umkomasia macleanii ovulate structure, Late Triassic, Molteno Formation, Umkomaas, South Africa. | |
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Genus: | Umkomasia Thomas 1933
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Species | |
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Umkomasia is a genus of seed ferns (Pteridospermophyta), and first based on fossils collected by Hamshaw Thomas from the Burnera Waterfall locality near the Umkomaas River of South Africa [3] He recognized on the basis of cuticular similarities that the same plant produced pollen organs Pteruchus and the leaves Dicroidium
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Umkomasia_macleani_reconstruction.jpg/200px-Umkomasia_macleani_reconstruction.jpg)
Description
Umkomasia has helmet like cupules around ovules born in complex large branching structures.
Whole plant associations
- Umkomasia feistmantelii from the Early Triassic of Australia may have been produced by the same plant as Pteruchus barrealensis (pollen organs) and Dicroidium zuberi (leaves)[4]
- Umkomasia macleanii from the Late Triassic of South Africa may have been produced by the same plant as Pteruchus africanus (pollen organs) and Dicroidium odontopteroides (leaves)[3][5]
See also
References
- ^ Gongle Shi, Andrew B. Leslie, Patrick S. Herendeen, Fabiany Herrera, Niiden Ichinnorov, Masamichi Takahashi, Patrick Knopf and Peter R. Crane (2016). "Early Cretaceous Umkomasia from Mongolia: implications for homology of corystosperm cupules". New Phytologist. 210 (4): 1418–1429. doi:10.1111/nph.13871.
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: CS1 maint: multiple names: authors list (link) - ^ However, Rothwell & Stockey (2016) transferred this species to the genus Doylea. See: Gar W. Rothwell; Ruth A. Stockey (2016). "Phylogenetic diversification of Early Cretaceous seed plants: The compound seed cone of Doylea tetrahedrasperma". American Journal of Botany. 103 (5): 923–937. doi:10.3732/ajb.1600030.
- ^ a b Thomas, H.H. (1933). "On some pteridospermous plants from the Mesozoic rocks of South Africa". Philosophical Transactions of the Royal Society Series B. 222: 193–265. doi:10.1098/rstb.1932.0016.
- ^ Retallack G.J. (1977). "Reconstructing Triassic vegetation of southeastern Australia: a new approach to the biostratigraphy of Gondwanaland". Alcheringa. 1: 247–265. doi:10.1080/03115517708527763.
- ^ Retallack, G.J.; Dilcher, D.L. (1988). "Reconstructions of selected seed ferns". Missouri Botanical Garden Annals. 75: 1010–1057. doi:10.2307/2399379.
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External links
- "Fossilworks: Lepidopteris". paleodb.org. Retrieved 2016-03-18.