Stephanosphaera: Difference between revisions
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{{Short description|Genus of algae}} |
{{Short description|Genus of algae}} |
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{{Speciesbox |
{{Speciesbox |
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| image = Stephanosphaera pluvialis.png |
| image = Stephanosphaera pluvialis retouched.png |
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| image_caption = ''Stephanosphaera pluvialis'' |
| image_caption = ''Stephanosphaera pluvialis'' |
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| genus = Stephanosphaera |
| genus = Stephanosphaera |
Latest revision as of 04:59, 28 December 2023
Stephanosphaera | |
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Stephanosphaera pluvialis | |
Scientific classification | |
(unranked): | Viridiplantae |
Division: | Chlorophyta |
Class: | Chlorophyceae |
Order: | Chlamydomonadales |
Family: | Haematococcaceae |
Genus: | Stephanosphaera Cohn |
Species: | S. pluvialis
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Binomial name | |
Stephanosphaera pluvialis Cohn
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Stephanosphaera is a genus of green algae in the family Haematococcaceae, containing the single species Stephanosphaera pluvialis.[1] It forms colonies of flagellated cells. Although it was once placed in the family Volvocaceae,[2] it is not closely related to them; its sister is the unicellular genus Balticola.[3]
Description
[edit]Stephanosphaera pluvialis forms colonies of four or eight cells, arranged in a ring and surrounded by a spherical matrix. Each cell is elongated, irregularly shaped with several protrusions that join the cells together. Cells contain several contractile vacuoles, a rounded stigma, and a single large parietal chloroplast with usually two pyrenoids. Cells have two flagella of equal length.[3][4]
Reproduction
[edit]Stephanosphaera pluvialis reproduces both asexually and sexually. Asexual reproduction occurs by autocolony formation: a cell divides until it becomes like a miniature version of the existing colony, and the new colony is released from the cell.[3] Sexual reproduction is done with gametes, which are isogamous.[3]
Distribution
[edit]Stephanosphaera pluvialis is found in freshwater habitats. It tends to occur in rainwater puddles on non-basic rocks, more rarely in lakes.[5] It is rare.[1]
References
[edit]- ^ a b Guiry, M.D.; Guiry, G.M. "Stephanosphaera". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2023-02-15.
- ^ Kofoid, C.A. (1899). "Plankton studies. III. On Platydorina, a new genus of the family Volvocidae, from the plankton of the Illinois River". Bulletin of the Illinois State Laboratory of Natural History. 5 (9): 419–440, pi. 38. doi:10.21900/j.inhs.v5.420.
- ^ a b c d Nakada, Takashi; Nozaki, Hisayoshi (2014). "Chapter 6. Flagellate 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.
- ^ Bicudo, Carlos E. M.; Menezes, Mariângela (2006). Gêneros de Algas de Águas Continentais do Brasil: chave para identificação e descrições (2 ed.). RiMa Editora. p. 508. ISBN 857656064X.
- ^ Kaštovský, Jan (2008). "A report of Stephanosphaera pluvialis Cohn 1852 (Chlorophyta, Chlamydophyceae)". Fottea. 8 (2): 109–110. doi:10.5507/fot.2008.006.