Umkomasia
| Umkomasia Temporal range: Early Triassic–Late Triassic | |
|---|---|
 | |
| Umkomasia macleanii ovulate structure, Late Triassic, Molteno Formation, Umkomaas, South Africa. | |
| Scientific classification | |
| Kingdom: | Plantae |
| Phylum: | †Pteridospermophyta |
| Order: | †Peltaspermales |
| Family: | †Corystospermaceae |
| Genus: | Umkomasia Thomas 1933 |
| Species | |
| |
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
Umkomasia macleanii reconstruction with pollen orgsn (Pteruchus africanus'') and leaves (Dicroidium odontopteroides) from the Late Triassic, Molteno Formation of South Africa
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.
- ↑ 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.
- 1 2 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.
External links
- "Fossilworks: Lepidopteris". paleodb.org. Retrieved 2016-03-18.
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