m Robot: Fixing double-redirect -"Nematophyta" +"Nematothallus" |
m Create page for "phylum", so Nematothallus can have its own genus page |
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{{taxobox |
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|fossil_range={{fossil range|424|410}}Upper [[Silurian]] - lowermost [[Devonian]] |
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|regnum = [[Plant]]ae |
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|phylum = '''Nematophyta''' |
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|phylum_authority = Strother 1993<ref name=Strother1993>{{cite journal |
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| author = Strother, P.K. |
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| year = 1993 |
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| title = Clarification of the Genus ''Nematothallus'' Lang |
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| journal = Journal of Paleontology |
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| volume = 67 |
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| issue = 6 |
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| pages = 1090-1094 |
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| url = http://links.jstor.org/sici?sici=0022-3360(199311)67%3A6%3C1090%3ACOTGNL%3E2.0.CO%3B2-3 |
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| accessdate = 2007-09-01 |
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}}</ref> |
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|classis= '''Nematophytina''' |
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|classis_authority = Strother 1993 |
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|ordo = '''Nematophytales''' |
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|ordo_authority = Lang 1937<ref name=Lang1937>{{cite journal |
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| author = Lang, W.H. |
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| year = 1937 |
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| title = On the Plant-Remains from the Downtonian of England and Wales |
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| journal = Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences |
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| volume = 227 |
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| issue = 544 |
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| pages = 245-291 |
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| url = http://links.jstor.org/sici?sici=0080-4622(19370607)227%3A544%3C245%3AOTPFTD%3E2.0.CO%3B2-2 |
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| accessdate = 2007-09-01 |
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}}</ref> |
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|familia = '''Nematothalaceae''' |
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|familia_authority = Strother 1993 |
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|subdivision_ranks = Genera |
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|subdivision = |
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:{{aut|Lang 1937}} |
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*''[[Cosmochlaina]]''}} |
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The '''Nematophytes''' are a group of land plants known only from the [[fossil]] record. Its type genus ''Nematothallus'', which typifies the group, was first described by Lang in 1933<ref name=Lang1937/>, who envisioned it being a [[thallus (tissue)|thallose]] plant with tubular features and sporophytes, covered by a cuticle which preserved impressions of the underlying cells. He had found abundant disaggregated remains of all three features, none of which were connected to another, leaving his reconstruction of the phytodebris as parts of a single organism highly conjectural. |
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The lack of a clear definition of the nematophytes has led to it being used as a wastebasket [[form taxon]], with all manner of tubes and cell-patterned cuticles from around the Silurian being dubbed "Nematophytic" more as a statement of ignorance than as a scientifically meaningful statement. |
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[[Linnean taxonomy]] struggles to accommodate most fossil groups, as they tend to form [[stem group]]s to modern taxa. Thus despite Strother's attempts to formalise the nomenclature of ''Nematothalli'', the hierarchy of class, order and family are better thought of as a stem group to the [[embryophyte]]s (modern land plants), with the [[green algæ]] a stem group to the Nematophytes in turn. |
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==References== |
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{{reflist}} |
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{{aut|McGregor and Narbonne}} (1978): "Upper Silurian trilete spores and other microfossils from the Read Bay Formation, Cornwallis Island, Canadian Arctic" |
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[[Category:Silurian life]] |
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[[Category:Prehistoric plants]] |
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[[Category:Fossils]] |
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Revision as of 11:07, 20 September 2007
| Nematophyta | |
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| Scientific classification | |
| Kingdom: | |
| Phylum: | Nematophyta Strother 1993[1]
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| Class: | Nematophytina Strother 1993
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| Order: | Nematophytales Lang 1937[2]
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| Family: | Nematothalaceae Strother 1993
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| Genera | |
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The Nematophytes are a group of land plants known only from the fossil record. Its type genus Nematothallus, which typifies the group, was first described by Lang in 1933[2], who envisioned it being a thallose plant with tubular features and sporophytes, covered by a cuticle which preserved impressions of the underlying cells. He had found abundant disaggregated remains of all three features, none of which were connected to another, leaving his reconstruction of the phytodebris as parts of a single organism highly conjectural.
The lack of a clear definition of the nematophytes has led to it being used as a wastebasket form taxon, with all manner of tubes and cell-patterned cuticles from around the Silurian being dubbed "Nematophytic" more as a statement of ignorance than as a scientifically meaningful statement.
Linnean taxonomy struggles to accommodate most fossil groups, as they tend to form stem groups to modern taxa. Thus despite Strother's attempts to formalise the nomenclature of Nematothalli, the hierarchy of class, order and family are better thought of as a stem group to the embryophytes (modern land plants), with the green algæ a stem group to the Nematophytes in turn.
References
- ^ Strother, P.K. (1993). "Clarification of the Genus Nematothallus Lang". Journal of Paleontology. 67 (6): 1090–1094. Retrieved 2007-09-01.
- ^ a b Lang, W.H. (1937). "On the Plant-Remains from the Downtonian of England and Wales". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 227 (544): 245–291. Retrieved 2007-09-01.
McGregor and Narbonne (1978): "Upper Silurian trilete spores and other microfossils from the Read Bay Formation, Cornwallis Island, Canadian Arctic"