World Library  
Flag as Inappropriate
Email this Article

Coscinodiscophyceae

Article Id: WHEBN0009913103
Reproduction Date:

Title: Coscinodiscophyceae  
Author: World Heritage Encyclopedia
Language: English
Subject: Plankton, Diatom, Thalassiosira pseudonana, Bacteriastrum, Axodine
Collection: Biological Oceanography, Diatoms, Planktology
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Coscinodiscophyceae

Coscinodiscophyceae is a class of diatom.[1]

Coscinodiscophyceae is similar to Centrales. Order Centrales is a traditional, paraphyletic subdivision of the heterokont algae known as diatoms.[2][3][4] The order is named for the shape of the cell walls (or valves or frustules) of centric diatoms, which are circular or ellipsoid in valve view. The valves often bear radially symmetrical ornamental patterns that can appear as dots when viewed with an optical microscope. Some also bear spines on their valves, which may either increase cell surface area and reduce sinking, or act as a deterrent to zooplankton grazers. Unlike pennate diatoms, centric diatoms never have a raphe.

In terms of cell cycle, vegetative cells are diploid and undergo mitosis during normal cell division. In sexual species, oogamous meiosis produces haploid gametes, either ova or sperm cells. These fuse to produce a zygote which expands in size to develop into an auxospore from which full-size vegetative cells are produced.

In some taxonomy schemes,[3] the centric diatoms are known instead as Order Coscinodiscophyceae. And in some schemes as order Biddulphiales.[5] However, diatom taxonomy is changing due to the development of new molecular and genetical analysis tools.[4]

Contents

  • See also 1
  • References 2
  • Further Reading 3
  • External links 4

See also

References

  1. ^ Cattolico RA, Jacobs MA, Zhou Y; et al. (2008). "Chloroplast genome sequencing analysis of Heterosigma akashiwo CCMP452 (West Atlantic) and NIES293 (West Pacific) strains". BMC Genomics 9: 211.  
  2. ^ Hoek, C. van den, Mann, D. G. and Jahns, H. M. (1995). Algae : An introduction to phycology, Cambridge University Press, UK.
  3. ^ a b Round, F. E. and Crawford, R. M. (1990). The Diatoms. Biology and Morphology of the Genera, Cambridge University Press, UK.
  4. ^ a b Williams, D. M., Kociolek, J. P., (2007). Pursuit of a natural classification of diatoms: History, monophyly and the rejection of paraphyletic taxa, European Journal of Phycology, 42:3, 313-319.
  5. ^ Tomas, C. R., Hasle G. R., Syvertsen, E. E., Steidinger, K. A., Tangen, K., Throndsen, J., Heimdal, B. R., (1997). Identifying Marine Phytoplankton, Academic Press.

Further Reading

Tremarin, Priscila; Veiga Ludwig, Thelma Alvim; Torgan, Lezilda Carvalho (November 7, 2014). "Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil". PHYTOTAXA 184 (4): 208-222.  

External links

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.