Dasycladales

Dasycladales Temporal range: Ordovician[1] to present
Scientific classification
Domain:	Eukaryota
Kingdom:	Plantae
Phylum:	Chlorophyta
Class:	Ulvophyceae
Order:	Dasycladales Pascher 1931[2]
families
Dasycladaceae Polyphysaceae

In taxonomy, the Dasycladales is an order of large unicellular green algae in the class Ulvophyceae.^[3] It contains two families, the Dasycladaceae and the Polyphysaceae.

These single celled algae are from 2 mm to 200 mm long. They live on substrates in shallow warm marine waters, usually less than 20 meters deep. They are very large cells. They are able to attain these sizes without numerous internal cell wells because they build calcium carbonate shells around themselves.

They contain only one nucleus in their vegetative stage, which remains in the bottom of the cell in the holdfast at the substrate. Only when they are ready to produce gametes does the nucleus undergo meiosis and then numerous mitoses into many nuclei which then migrate into the gametangia at the top of the algae.

Because the nucleus is safely hidden in the holdfast, the cells easily regenerate if the top portions are broken off.

These algae are notable for having an intracellular network of 10 nm proteinaceous filaments, possibly for the storage and transport of ribonucleoprotein particles.^[4]

Because of all these properties, and the fact that they are easy to manipulate they have been favorite organisms in the study of the role of the nucleus vs the unnucleated cytoplasm in the behavior of cells.

A fossil receptaculitid, considered a member of the Order Dasycladales; Ordovician of Estonia.

References

1. ^ e.g. Young, G.A.; Rudkin, D.M.; Dobrzanski, E.P.; Robson, S.P.; Nowlan, G.S. (2007). "Exceptionally preserved Late Ordovician biotas from Manitoba, Canada". Geology 35 (10): 883–886. doi:10.1130/G23947A.1. 
2. ^ Womersley HBS (1984). The marine benthic flora of southern Australia. Part I. Adelaide: Government Printer, South Australia. 
3. ^ Guiry, MD; GM Guiry (2007). "AlgaeBase version 4.2 Taxonomy Browser". AlgaeBase. National University of Ireland, Galway. http://www.algaebase.org/browse/taxonomy/?id=4563. Retrieved 2007-09-22. 
4. ^ Berger, S; Wittke W, Traub P (1998). "Occurrence of proteinaceous 10-nm filaments throughout the cytoplasm of algae of the order Dasycladales". Experimental Cell Research 240 (2): 176–186. doi:10.1006/excr.1997.3924. PMID 9596990. 

External links

• Berger, Sigrid (2006).- Photo-Atlas of living Dasycladales.- ISBN 2-916733-01-9, Carnets de Géologie, Brest, Book / Livre 2006/02 (CG2006_BOOK_02), 348 p., 1 fig., 332 micrographs.
• Génot, Patrick (2009).- Cenozoic Dasycladales. A photo-atlas of Lutetian species from French Cenozoic basins.- ISBN 978-2-916733-03-6, Carnets de Géologie, Brest, Special Publication 2009/01 (CG2009_SP01), 180 p., 2 figs., 29 pls.