Yunia: Difference between revisions
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| unranked_classis = [[Tracheophyta]] |
| unranked_classis = [[Tracheophyta]] |
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| genus= † '''''Yunia''''' |
| genus= † '''''Yunia''''' |
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| genus_authority = Hao & Beck (1991)<ref>{{Citation |last=Hao |first=Shou-Gang |last2=Beck |first2=Charles B. |year=1991 |title=''Yunia dichotoma'', a Lower Devonian plant from Yunnan, China |journal=Review of Palaeobotany and Palynology |volume=68 |issue=3-4 |pages=181–195 |doi=10.1016/0034-6667(91)90022-U |lastauthoramp=yes }}</ref> |
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| subdivision_ranks = Species |
| subdivision_ranks = Species |
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| subdivision = † ''Y. dichotoma'' <small>Hao & Beck (1991)</small> |
| subdivision = † ''Y. dichotoma'' <small>Hao & Beck (1991)</small> |
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Revision as of 13:54, 7 February 2011
| Yunia Temporal range: Early Devonian
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| Scientific classification | |
| Kingdom: | |
| Subkingdom: | |
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| (unranked): | |
| Genus: | † Yunia Hao & Beck (1991)[1]
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| Species | |
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† Y. dichotoma Hao & Beck (1991) | |
Yunia is a genus of extinct vascular plants from the Early Devonian (the Pragian stage, around 410 million years ago). The leafless plant consisted of spiny stems which branched dichotomously in a cruciate arrangement. Each stem contained vascular tissue with one or two strands of protoxylem. The spore-forming organs (sporangia) were elongated. The spores had a relatively smooth sculptural pattern and were trilete (i.e. each spore has three lines on it resulting from its formation in a tetrahedral set of four spores).[2]
In 2004, Crane et al. published a simplified cladogram for the polysporangiophytes in which Yunia is basal to the lycophytes (clubmosses and relatives).[3] It had previously been placed in the 'trimerophytes' (a group now thought to be paraphyletic) which were considered to have given rise to all the other vascular plants except the lycophytes.[4]
| tracheophytes |
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References
- ^ Hao, Shou-Gang; Beck, Charles B. (1991), "Yunia dichotoma, a Lower Devonian plant from Yunnan, China", Review of Palaeobotany and Palynology, 68 (3–4): 181–195, doi:10.1016/0034-6667(91)90022-U
{{citation}}: Unknown parameter|lastauthoramp=ignored (|name-list-style=suggested) (help) - ^ Taylor, T.N.; Taylor, E.L.; Krings, M. (2009), Paleobotany : The Biology and Evolution of Fossil Plants (2nd ed.), Amsterdam; Boston: Academic Press, ISBN 978-0-12-373972-8
{{citation}}: Unknown parameter|lastauthoramp=ignored (|name-list-style=suggested) (help), p. 262 - ^ Crane, P.R.; Herendeen, P.; Friis, E.M. (2004), "Fossils and plant phylogeny", American Journal of Botany, 91: 1683–99, doi:10.3732/ajb.91.10.1683, retrieved 2011-01-27
- ^ Taylor, Taylor & Krings 2009, p. 259ff.
