Superregnum: Eukaryota
Regnum: Plantae
Divisio: Chlorophyta
Subphylum: Chlorophytina
Classis: Chlorophyceae
Ordo: Chlamydomonadales
Familia: incertae sedis
Genus: Desmatractum
Species: D. bipyramidatum – D. delicatissimum – D. elongatum – D. indutum – D. nyanzae – D. obtusum – D. plicatum – D. spryii
Name
Desmatractum West & G.S.West, 1902: 198, pl. 17: figs 14, 15
Type Species: Desmatractum plicatum West & G.S.West
Synonyms
Bernardinella Chodat, 1921: 300, fig. 6
Type Species: Bernardinella bipyramidata Chodat
Calyptobactron Geitler, 1924
Type Species: Calyptobactron indutum Geitler
Peniococcus Wołoszyńska, 1914
Type Species: Peniococcus nyanzae Wołoszyńska: 205
References
West, W. & West, G.S. 1902. A contribution to the freshwater algae of Ceylon. Transactions of the Linnean Society of London, Botany, Series 2, 6: 123–215, pls 17–22. BHL Reference page.
Chodat, R. 1921. Algues de la région du Grand St. Bernard. I. Algues rares ou nouvelles du Plan de Jupiter. II. Sur la place à attribuer aux genres Tetraedron et Polyedrium. Bulletin de la Société de Botanique de Genève ser. 2 12: 293–305. BHL Reference page.
Geitler. L. 1924. Über Acanthosphaera Zachariasi und Calyptobactron indutum nov. gen. et n. sp., zwei planktonische Protococcaceen. Österreichische Botanische Zeitschrift 73(10/12): 247–261. JSTOR Reference page.
Wołoszyńska, J. 1914. Studien über das Phytoplankton des Viktoriasees. Schröders Zellpflanzen Ostafrikas. Hedwigia 55: 184–223. BHL Reference page.
Links
Guiry, M.D. & Guiry, G.M. 2024. Desmatractum. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Accessed 2024-03-20.
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
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
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.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
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
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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