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{{Short description|Extinct genus of spore-bearing plants}}
{{Italic title}}
{{Use dmy dates|cs1-dates=ly|date=June 2020}}
{{Automatic taxobox
{{Automatic taxobox
|fossil_range = {{Geological range/linked|Early Devonian}}
| fossil_range = {{Geological range/linked|Early Devonian}}
| image = Yunia dichotoma reconstruccion.jpg
|authority = S.G.Hao & C.B.Beck (1991)<ref name="HaoBeck1991">{{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>
| image_upright = 0.7
| image_caption = Reconstruction of ''Yunia dichotoma'' according to its description.
| taxon = Yunia
| authority = S.G.Hao & C.B.Beck (1991)<ref name="HaoBeck1991"/>
| display_parents = 7
| type_species = '''''Yunia dichotoma'''''
| type_species_authority = S.G.Hao & C.B.Beck (1991)
| subdivision_ranks = Species
| subdivision_ranks = Species
| subdivision = †''Y. dichotoma'' <small>S.G.Hao & C.B.Beck (1991)</small>
| subdivision =
* †''Y. dichotoma'' <small>S.G.Hao & C.B.Beck (1991)</small>
* †''Y. guangnania'' <small>S.G.Hao & Xue (2013)</small>

}}
}}
⚫
'''''Yunia''''' is a genus of extinct [[vascular plant]]s from the [[Early Devonian]] (Pragian or Siegenian stage, around {{Period span/brief|Pragian}}). It was first described from the Posongchong Formation of [[Yunnan]], China. The leafless plant consisted of spiny stems, some 2 to 5&nbsp;cm wide, which branched dichotomously at wide angles in a cruciate arrangement. Each stem contained [[vascular tissue]] with one or two strands of [[Xylem#Primary_and_secondary_xylem|protoxylem]]. The spore-forming organs ([[Sporangium|sporangia]]) were elongated and borne on short stalks. 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).<ref name="HaoBeck1991"/><ref>{{Citation |last=Taylor |first=T.N. |last2=Taylor |first2=E.L. |last3=Krings |first3=M. |year=2009 |title=Paleobotany : The Biology and Evolution of Fossil Plants |edition=2nd |publication-place=Amsterdam; Boston |publisher=Academic Press |isbn=978-0-12-373972-8 |lastauthoramp=yes }}, p. 262</ref>


⚫
'''''Yunia''''' is a [[genus]] of extinct [[vascular plant]]s from the [[Early Devonian]] (Pragian or Siegenian stage, around {{Period span/brief|Pragian}}). It was first described from the Posongchong Formation of [[Yunnan]], China. The leafless plant consisted of spiny stems, some 2 to 5&nbsp;cm wide, which branched dichotomously at wide angles in a cruciate arrangement. Each stem contained [[vascular tissue]] with one or two strands of [[Xylem#Primary and secondary xylem|protoxylem]]. The spore-forming organs ([[Sporangium|sporangia]]) were elongated and borne on short stalks. 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).<ref name="HaoBeck1991">{{Citation |last1=Hao |first1=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 |hdl=2027.42/29227 |name-list-style=amp |url=https://deepblue.lib.umich.edu/bitstream/2027.42/29227/1/0000282.pdf |hdl-access=free }}</ref><ref>{{Citation |last1=Taylor |first1=T.N. |last2=Taylor |first2=E.L. |last3=Krings |first3=M. |year=2009 |title=Paleobotany : The Biology and Evolution of Fossil Plants |edition=2nd |location=Amsterdam; Boston |publisher=Academic Press |isbn=978-0-12-373972-8 |name-list-style=amp }}, p. 262</ref>
⚫
In 2004, Crane et al. published a simplified [[cladogram]] for the [[polysporangiophyte]]s in which ''Yunia'' is basal to the [[Lycopodiophyta|lycophytes]] (clubmosses and relatives).<ref>{{Citation |last=Crane |first=P.R. |last2=Herendeen |first2=P. |last3=Friis |first3=E.M. |year=2004 |title=Fossils and plant phylogeny |journal=American Journal of Botany |volume=91 |pages=1683–99 |url=http://www.amjbot.org/cgi/content/full/91/10/1683 |accessdate=2011-01-27 |doi=10.3732/ajb.91.10.1683}}</ref> It had previously been placed in the "[[trimerophyte]]s"<ref name="HaoBeck1991"/> (a group now thought to be paraphyletic), which were considered to have given rise to all the other vascular plants ''except'' the lycophytes.<ref>{{Harvnb|Taylor|Taylor|Krings|2009|p=259ff.}}</ref>

⚫
In 2004, Crane et al. published a simplified [[cladogram]] for the [[polysporangiophyte]]s in which ''Yunia'' is basal to the [[Lycopodiophyta|lycophytes]] (clubmosses and relatives).<ref>{{Citation |last1=Crane |first1=P.R. |last2=Herendeen |first2=P. |last3=Friis |first3=E.M. |year=2004 |title=Fossils and plant phylogeny |journal=American Journal of Botany |volume=91 |pages=1683–99 |doi=10.3732/ajb.91.10.1683 |issue=10 |pmid=21652317|doi-access=free }}</ref> It had previously been placed in the "[[trimerophyte]]s"<ref name="HaoBeck1991"/> (a group now thought to be paraphyletic), which were considered to have given rise to all the other vascular plants ''except'' the lycophytes.<ref>{{Harvnb|Taylor|Taylor|Krings|2009|p=259ff.}}</ref>
{{clade
{{clade
| label1=[[tracheophyte]]s
| label1=[[tracheophyte]]s
| 1={{Clade tracheophyte|lycophytes=collapsed|euphyllophytes=collapsed}}
| 1={{Clade tracheophyte|lycophytes=collapsed|euphyllophytes=collapsed}}
}}
}}
Hao and Xue in 2013 considered the genus as a questionable zosterophyll.<ref name=HaoXue13/>


==References==
==References==
{{Reflist|refs=
{{reflist}}
<ref name=HaoXue13>{{Citation |last1=Hao |first1=Shougang |last2=Xue |first2=Jinzhuang |date=2013 |title=The early Devonian Posongchong flora of Yunnan: a contribution to an understanding of the evolution and early diversification of vascular plants |location=Beijing |publisher=Science Press |isbn=978-7-03-036616-0 |url=https://www.researchgate.net/publication/269875285 |access-date=2019-10-25 |page=52 |name-list-style=amp }}</ref>
}}


==External links==
==External links==
* [http://www.amjbot.org/content/vol91/issue10/images/large/abot-91-10-04-f01.jpeg Cladogram] from {{Harvnb|Crane|Herendeen|Friis|2004}}
* [https://archive.today/20121204162818/http://www.amjbot.org/content/vol91/issue10/images/large/abot-91-10-04-f01.jpeg Cladogram] from {{Harvnb|Crane|Herendeen|Friis|2004}}

{{Taxonbar|from=Q8061285}}


[[Category:Devonian life]]
[[Category:Early Devonian plants]]
[[Category:Prehistoric plants]]
[[Category:Zosterophylls]]
[[Category:Prehistoric lycophyte genera]]

Latest revision as of 17:44, 3 January 2024

Yunia
Temporal range: Early Devonian
Reconstruction of Yunia dichotoma according to its description.
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Streptophyta
Clade: Embryophytes
Clade: Polysporangiophytes
Clade: Tracheophytes
Clade: Lycophytes
Plesion: †Zosterophylls (?)
Genus: †Yunia
S.G.Hao & C.B.Beck (1991)[1]
Type species
Yunia dichotoma
S.G.Hao & C.B.Beck (1991)
Species
  • †Y. dichotoma S.G.Hao & C.B.Beck (1991)
  • †Y. guangnania S.G.Hao & Xue (2013)

Yunia is a genus of extinct vascular plants from the Early Devonian (Pragian or Siegenian stage, around 411 to 408 million years ago). It was first described from the Posongchong Formation of Yunnan, China. The leafless plant consisted of spiny stems, some 2 to 5 cm wide, which branched dichotomously at wide angles in a cruciate arrangement. Each stem contained vascular tissue with one or two strands of protoxylem. The spore-forming organs (sporangia) were elongated and borne on short stalks. 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).[1][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"[1] (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

† Rhyniaceae (Huvenia, Rhynia, Stockmansella)

† basal groups (Aberlemnia caledonica [=Cooksonia caledonica], Cooksonia pertoni)

 † basal groups 

Cooksonia cambrensis, Renalia, Sartilmania, Uskiella, Yunia

lycophytes

euphyllophytes

Hao and Xue in 2013 considered the genus as a questionable zosterophyll.[5]

References[edit]

  1. ^ a b c Hao, Shou-Gang & Beck, Charles B. (1991), "Yunia dichotoma, a Lower Devonian plant from Yunnan, China" (PDF), Review of Palaeobotany and Palynology, 68 (3–4): 181–195, doi:10.1016/0034-6667(91)90022-U, hdl:2027.42/29227
  2. ^ 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, p. 262
  3. ^ Crane, P.R.; Herendeen, P.; Friis, E.M. (2004), "Fossils and plant phylogeny", American Journal of Botany, 91 (10): 1683–99, doi:10.3732/ajb.91.10.1683, PMID 21652317
  4. ^ Taylor, Taylor & Krings 2009, p. 259ff.
  5. ^ Hao, Shougang & Xue, Jinzhuang (2013), The early Devonian Posongchong flora of Yunnan: a contribution to an understanding of the evolution and early diversification of vascular plants, Beijing: Science Press, p. 52, ISBN 978-7-03-036616-0, retrieved 2019-10-25

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Yunia&oldid=1193405013"