Desmatractum: Difference between revisions
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'''''Desmatractum''''' is a [[genus]] of [[green algae]], in the order [[Chlamydomonadales]].<ref name=AB_g44249>{{AlgaeBase genus|name=Desmatractum|id=44249|access-date=2022-02-25}}</ref> |
'''''Desmatractum''''' is a [[genus]] of [[green algae]], in the order [[Chlamydomonadales]].<ref name=AB_g44249>{{AlgaeBase genus|name=Desmatractum|id=44249|access-date=2022-02-25}}</ref> It is found in freshwater habitats such as ponds, ditches, and bogs as [[plankton]] or metaphyton.<ref name=Shubert2014>{{cite book |editor-first1=John D.|editor-last1=Wehr|editor-first2=Robert G.|editor-last2=Sheath|editor-first3=J. Patrick|editor-last3=Kociolek |date= 2014 |edition=2 |title= Freshwater Algae of North America: Ecology and Classification |last1= Shubert|first1=Elliot| last2=Gärtner |first2=Georg |chapter= Chapter 7. Nonmotile Coccoid and Colonial Green Algae |url= |location= |publisher= Elsevier Inc. |page= |isbn=978-0-12-385876-4 }}</ref> The genus is [[cosmopolitan distribution|cosmopolitan]], but some species are very rare.<ref name=AB_g44249/> |
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==Description== |
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''Desmatractum'' is microscopic and consists of single cells. The cells are spherical or ellipsoidal, and are surrounded by a cell envelope that tapers at both ends, making the form overall spindle-shaped. The envelope has 4 to 20 longitudinal ridges, and may be constricted at the equator. The [[chloroplast]] is parietally located and contains one or two [[pyrenoid]].<ref name=Shubert2014/><ref name=AB_g44249/> |
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Species are distinguished from each other by the overall shape and size of the cells, as well as the degree of longitudinal ribbing of the cell envelopes.<ref name=AB_g44249/> Species that appear similar in the [[light microscope]] have very different [[ultrastructure]]s, and this may be a sign that taxonomic revision is necessary.<ref name=AB_g44249/> |
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Reproduction occurs [[asexual reproduction|asexually]], where the [[protoplast]] divides into four [[zoospore]]s which are then released through a tear in the cell envelope. Zoospores are oval or elongate, with a single chloroplast and [[eyespot apparatus|eyespot]], as well as two identical anterior [[flagella]]. Sexual reproduction has not been observed in ''Desmatractum''.<ref name=AB_g44249/> |
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==References== |
==References== |
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Revision as of 23:02, 30 November 2024
| Desmatractum | |
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| Desmatractum bipyramidatum | |
Scientific classification 
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| Clade: | Viridiplantae |
| Division: | Chlorophyta |
| Class: | Chlorophyceae |
| Order: | Chlamydomonadales |
| Family: | incertae sedis |
| Genus: | Desmatractum West & G.S.West, 1902[1] |
| Type species | |
| Desmatractum plicatum West & G.S.West[1]
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| Species[1] | |
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| Synonyms[2][3] | |
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Bernardinella Choda, 1925 | |
Desmatractum is a genus of green algae, in the order Chlamydomonadales.[1] It is found in freshwater habitats such as ponds, ditches, and bogs as plankton or metaphyton.[4] The genus is cosmopolitan, but some species are very rare.[1]
Description
Desmatractum is microscopic and consists of single cells. The cells are spherical or ellipsoidal, and are surrounded by a cell envelope that tapers at both ends, making the form overall spindle-shaped. The envelope has 4 to 20 longitudinal ridges, and may be constricted at the equator. The chloroplast is parietally located and contains one or two pyrenoid.[4][1]
Species are distinguished from each other by the overall shape and size of the cells, as well as the degree of longitudinal ribbing of the cell envelopes.[1] Species that appear similar in the light microscope have very different ultrastructures, and this may be a sign that taxonomic revision is necessary.[1]
Reproduction occurs asexually, where the protoplast divides into four zoospores which are then released through a tear in the cell envelope. Zoospores are oval or elongate, with a single chloroplast and eyespot, as well as two identical anterior flagella. Sexual reproduction has not been observed in Desmatractum.[1]
References
- ^ a b c d e f g h i Guiry, M.D.; Guiry, G.M. "Desmatractum". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2022-02-25.
- ^ P. Chodat. Algue de la région du Grand St Bernard. Bulletin de la Société botanique de Genève, 1918, Bernardinella page 300 : read on line
- ^ Peniococcus Woloszynska, 1914-AlgaeBase : read on line
- ^ a b Shubert, Elliot; Gärtner, Georg (2014). "Chapter 7. Nonmotile Coccoid and Colonial Green Algae". In Wehr, John D.; Sheath, Robert G.; Kociolek, J. Patrick (eds.). Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc. ISBN 978-0-12-385876-4.
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